A blue-water navy is a maritime force capable of operating globally, essentially across the deep waters of open oceans. While definitions of what actually constitutes such a force vary, there is a requirement for the ability to exercise sea control at wide ranges.
The Defense Security Service of the United States has defined the blue-water navy as "a maritime force capable of sustained operation across the deep waters of open oceans. A blue-water navy allows a country to project power far from the home country and usually includes one or more aircraft carriers. Smaller blue-water navies are able to dispatch fewer vessels abroad for shorter periods of time."
In public discourse blue-water capability is identified with the operation of iconic capital ships such as battleships/battlecruisers, aircraft carriers, and nuclear submarines. For instance, during the debate in the 1970s whether Australia should replace HMAS Melbourne, a former chief of navy claimed that if Australia did not replace her last aircraft carrier, she "would no longer have a blue-water navy". In the end Australia did not buy a new carrier, but former Parliamentary defence advisor Gary Brown could still claim in 2004 that her navy remained "an effective blue-water force". The Soviet Navy towards the end of the Cold War is another example of a blue-water navy that had minimal carrier aviation, relying instead on submarines, missile-carrying surface ships, and long-range bombers based on land.
A blue-water navy implies force protection from sub-surface, surface and airborne threats and a sustainable logistic reach, allowing a persistent presence at range. A hallmark of a true blue-water navy is the ability to conduct replenishment at sea (RAS), and the commissioning of underway replenishment ships is a strong sign of a navy's blue-water ambitions. While a blue-water navy can project sea control power into another nation's littoral, it remains susceptible to threats from less capable forces (asymmetric warfare). Maintenance and logistics at range have high costs, and there might be a saturation advantage over a deployed force through the use of land-based air or surface-to-surface missile assets, diesel-electric submarines, or asymmetric tactics such as Fast Inshore Attack Craft. An example of this vulnerability was the October 2000 USS Cole bombing in Aden.
The term 'blue-water navy' should not be confused with the capability of an individual ship. For example, vessels of a green-water navy can often operate in blue water for short periods of time. A number of nations have extensive maritime assets but lack the capability to maintain the required sustainable logistic reach. Some of them join coalition task groups in blue-water deployments such as anti-piracy patrols off Somalia.
In their 2012 publication, "Sea Power and the Asia-Pacific", professors Geoffrey Till and Patrick C. Bratton outlined what they termed as "concise criteria" with regard to the definitions of brown, green and blue-water navies. Quote; "...a brown-water navy standing for a navy capable of defending its coastal zones, a green-water navy for a navy competent to operate in regional sea and finally [a] blue-water navy described as a navy with capability to operate across the deep waters." They go on to say that even with such a definition and understanding of naval hierarchy, it is still "ambiguous". For example, while France and the United States may be considered blue-water navies, he states that the "operational capability and geographic reach of both navies are definitely different." 
Another definition states that 'brown-water' refers to the littoral areas within 100 nautical miles of the coastline. 'Green-water' begins from 100 nautical miles out to the next major land formation, while 'blue-water' is the ability to project force out to at least 1,500 nautical miles beyond the coast. Traditionally a distinction used to be made between a coastal brown-water navy operating in the littoral zone to 200 nautical miles (or 370 kilometres) and an oceangoing blue-water navy. However, the United States Navy created a new term, green-water navy, to replace the term 'brown-water navy' in US Navy parlance. Today, a brown-water navy has become to be known as a predominately riverine force.
Despite the above however, there is no agreed definition of the term.
There have been many attempts by naval scholars and other authorities to classify world navies, including; Michael Morris, British naval historians Eric Grove and Professor Geoffrey Till, French strategist Hervé Coutau-Bégarie and professors Daniel Todd and Michael Lindberg. All identify a basic common criteria for gauging the capability of navies, such as; total displacement and number of ships; modernity and power of weapons and systems; logistical and geographic reach with capacity for sustained operations; and the professional qualifications/disposition of sailors.
The table below shows the world naval hierarchy according to the classification system by professors Daniel Todd and Michael Lindberg. Their system originates from 1996 and outlines ten ranks, distinguished by capability. Since then it has been used by various other experts to illustrate the subject. According to Todd and Lindberg, a "blue-water navy" is one that can project any sort of power beyond its own territorial waters. However they used the principle of loss of strength gradient and other criteria to distinguish navies by capability under the four "blue-water" ranks. The six ranks of "Non blue-water navies" can be further broken down into "green-water" and "brown-water navies", and according to Todd and Lindberg, these are navies only capable of operating as coastal defence forces, coast guards or riverine forces.
|Multiple and sustained power projection missions globally||United States|
|At least one major power projection operation globally||France, United Kingdom|
|Power projection to regions adjacent to its own||China, India, Italy, Russia|
|Limited range power projection beyond exclusive economic zone (EEZ)||Australia, Brazil, Germany, Japan, Netherlands, South Korea, Spain, Turkey|
|Non blue-water||5||Regional offshore
|Coastal defence within and slightly beyond EEZ||Argentina, Canada, Chile, Denmark, Indonesia, Israel, Norway, Saudi Arabia, Singapore, and others|
|Coastal defence confined to inner EEZ||Oman, Finland, North Korea, and many others|
|Maritime policing within and slightly beyond EEZ||Mexico, Ireland, and many others|
|Maritime policing confined well within EEZ||Philippines, and many others|
|Riverine defence of landlocked states||Bolivia, Paraguay, and many others|
|Very basic constabulary if at all||Many examples worldwide|
Historically, and to present day, blue-water navies have tended to establish overseas bases to extend the reach of supply lines, provide repair facilities and enhance the "effective striking power" of a fleet beyond the capabilities provided by the nations homeports. Generally, these overseas bases are located within areas where potential conflicts or threats to the nation's interests may arise. For example, since World War II the Royal Navy and later the United States Navy have continued to base forces in Bahrain for operations in the Persian Gulf. The military importance and value of overseas basing is primarily dependent on geographical location. A base located at choke points in narrow or enclosed seas can be of high value, especially if positioned near, or within striking distance of an enemy's sea lines of communications. However advanced operating bases (or forward operating bases) can be equally as valuable. Naval Station Pearl Harbor acts as a "gateway" for the US Navy to "operate forward" in the Pacific Ocean.
These are examples of navies that have been described by various defense experts or academics as being blue-water navies. Some have successfully used their blue-water capabilities to exercise control on the high seas and from there have projected power into other nations' littoral waters. However, there is no agreed upon definition among authorities as to what constitutes a blue-water navy.
The People's Liberation Army Navy is subject to a variety of assessments regarding its capabilities. Writing for the US Naval Institute, Dr James Mulvenon believes that "the Chinese navy is still primarily a brown and green-water navy", highlighting problems with replenishment and logistics as key shortcomings in PLAN ambitions of becoming a blue-water capable fleet. This line of thinking has also been held by a number of academics throughout the years, including Dr Peter Howarth, Professor Timo Kivimäki, Dr Denny Roy, and Professor Bart Dessein.
China's ambition towards blue-water capability has received much attention, particularly from the United States Congress and Department of Defense, with both acknowledging that China's primary aim is to project power in the First and Second island chains. In a 2013 report to Congress, defense experts also assert that over the coming decades, China will gain the capability to project power across the globe – similar to Britain's 1982 Falklands War. In addition, there are those who think China already has a blue-water navy, such as British naval historian and professor, Geoffrey Till, and also, Professor David Shambaugh who believes that the PLAN has transitioned from a green-water navy to that of a "limited" blue-water navy. According to Todd and Lindberg's classification system, the PLAN is a rank four "regional power projection navy". The PLA Navy has 70 per cent stake in Kyaukpyu port in Myanmar, which sits in the Bay of Bengal, Hambanthota port in South Sri Lanka dominates the Indian Ocean, Gwadar port in Pakistan sits on the mouth of Gulf of Oman and the port of Jask in Iran is located on the edge of Persian Gulf.
The French Navy is recognised as being a blue-water navy by various experts and academics.[A] According to professors Daniel Todd and Michael Lindberg, the French Navy is a rank two "limited global-reach power projection navy".
The navy operates a single nuclear-powered aircraft carrier (Charles de Gaulle) which forms the centrepiece of the Navy's principal expeditionary task group (known as the Aeronaval Group). In addition to this, the navy maintains a secondary Amphibious Group (known as Le Groupe Amphibie) based around the Mistral-class amphibious assault ships. Both these formations are part of the Force d'action navale (or Naval Action Force). The 'Forces sous-marines' operates four nuclear-powered ballistic missile submarines and six nuclear-powered fleet submarines. France retains a network of overseas naval facilities around the world; from Fort de France in the Caribbean, to Le Port, Réunion in the Indian Ocean, Papeete in the Pacific and in several other parts of the world too, including the Gulf, South Atlantic and the Western Pacific.
The navy's operational duties include the protection of French interests abroad and the security of the nation's many overseas departments and territories, as such the Navy undertakes a number of standing commitments worldwide.
The Indian Navy is unique among Asian navies due to its long experience in carrier power projection since 1961. This, according to Dr. George J. Gilboy and Political Scientist Eric Heginbotham, gives the Indian Navy the "leading power projection capability" in the region". The Indian Navy is also the only Asian navy considered to be a rank three "multi-regional power projection navy" per Todd and Lindberg's classification system. In his discussion paper for Consultancy Africa Intelligence, Greg Ryan asserts that in recent years, the Indian Navy has emerged as a "global power in the blue water sense".
India initially outlined its intentions of developing blue-water capabilities under the 2007 Maritime Capabilities Perspective Plan, with the navy's priority being the projection of "power in India’s area of strategic interest", the Indian Ocean Region. Since 2007 the navy has increased its presence in the Persian Gulf and the Horn of Africa to the Strait of Malacca, and routinely conducts anti-piracy operations and partnership building with other navies in the region. It also conducts routine two to three month-long deployments in the South and East China seas as well as the western Mediterranean simultaneously. The navy has a listening post in Madagascar.
The navy operates one single carrier task force centered on INS Vikramaditya, after INS Viraat was decommissioned in March 2017; however, a new aircraft carrier, INS Vikrant is currently fitting out and is due to commission around 2020, restoring India's two-carrier capability. The Indian Navy also possesses an amphibious transport dock, INS Jalashwa, and currently operates INS Arihant, an indigenously developed nuclear-powered ballistic missile submarine, along with leasing one Akula-class nuclear-powered attack submarine from Russia.
The Italian Navy has been categorised as a "regional blue-water navy" in Liu Huaqing's Memoirs (1994), and as a rank three "multi regional power projection navy" by Professors Daniel Todd and Michael Lindberg in 1996. In the former 1989 publication "The Atlantic Alliance and the Middle East", Joseph I. Coffey asserted that Italy's blue-water capabilities didn't extend beyond the Mediterranean sea. Today the navy possesses two aircraft carriers (Cavour and Giuseppe Garibaldi) as well as a modern fleet of surface combatants and submarines. The Marina Militare routinely deploys to the Indian Ocean and Persian Gulf as part of multinational anti-piracy missions such as Operation Ocean Shield and Operation Atalanta, and is capable of deploying a carrier battle group in support of NATO or EU operations such as during Operation Enduring Freedom (2001) and EU Navfor Med (European migrant crisis). in 2015 scholar Sarah Kirchberger has mentioned Italy as a blue-water navy capable of operate in the high seas far from its home.
The Russian Navy (the then Soviet Navy) maintained naval forces able to rival those of the United States; however, following the end of the Cold War and dissolution of the Soviet Union in 1991, the fleet experienced a severe decline due to lack of funding. By the late 1990s, there was little tangible evidence of Russian blue-water capability. It wasn't until 2007, under President Vladimir Putin, that "naval ambition broadened in scope and aimed at re-creating a large blue-water navy". Today, the Russian Navy is considered to be a rank 3 "multi-regional power projection navy" by Todd and Lindberg's classification system. The Russian Navy has also been described as a blue-water navy by British naval historian, Professor Geoffrey Till.
Analysts have mentioned that as opposed to the focus on submarine operations in the North Atlantic during the Cold War era, Russia's strategic emphasis has shifted towards the Pacific regions where a rising China and the United States "Asia-Pacific Pivot" are potential threats.
Russia maintains a single overseas naval facility in Tartus, Syria, which hosts a Soviet-era naval supply and maintenance facility. The facility provides technical maintenance and logistical support to Russian warships deployed in the Mediterranean. Since 2008, there has been a notable increase in Russian naval activity, primarily in the Atlantic, Mediterranean, Caribbean and Indian Ocean.
The Royal Navy is considered to be a blue-water navy by naval experts and academics. This position is likely to be further cemented with the introduction of two new Queen Elizabeth-class aircraft carriers, thirteen new frigates (8 Type 26, and 5 Type 31) and other warships currently being procured.[A][B] A term used commonly in the United Kingdom is that the Royal Navy maintains a maritime expeditionary capability. According to Todd and Lindberg's classification system, the Royal Navy is a rank two "limited global-reach power projection navy".
The Royal Navy supports a number of standing commitments worldwide on a continuous basis and maintains an expeditionary task force known as the Joint Expeditionary Force (Maritime) (JEF (M)). The Royal Navy Submarine Service operates four Vanguard Class nuclear-powered ballistic missile submarines and seven nuclear-powered Astute Class fleet submarines which operate globally. The Royal Fleet Auxiliary maintains a number of ships which support Royal Navy operations globally by resupplying personell, food, water, armament and fuel to their ships. The RFA also augment the Royal Navy's amphibious landing capabilities by operating the Bay Class. The United Kingdom maintains five overseas naval facilities, including a refuelling station at Sembawang, Singapore in the Far East.
The U.S. Naval War College identifies the Royal Navy's tasks as fighting wars, conducting distant expeditions, maintaining good order at sea and preventing and deterring conflict. As such, the Navy views the retention of its "world-class" high-end disciplines in anti-air and anti-submarine warfare as strategically important. The Royal Navy has shown many examples of its expeditionary capabilities[C] since World War II, such as the Korean War, the 1982 Falklands War, the 1990-91 Gulf War, Sierra Leone, the War in Afghanistan, the 2003 invasion of Iraq, and during the 2011 military intervention in Libya.
The United States Navy is considered a blue-water navy by experts and academics. It is distinguished from other power projection navies in that it is considered a global blue-water navy, able to operate in the deep waters of every ocean simultaneously. According to Todd and Lindberg's classification system, the United States Navy is a rank one "global-reach power projection navy", and the only navy to occupy this rank.
The USN maintains ten carrier strike groups (centered on the Nimitz-class aircraft carrier and Gerald R. Ford-class aircraft carriers), of which six are deployed or ready for deployment within 30 days, and two ready for deployment within 90 days under the Fleet Response Plan (FRP). The USN also maintains a continuous deployment of nine expeditionary strike groups that embark a Marine Expeditionary Unit with an Aviation Combat Element on amphibious warfare ships. The US Military Sealift Command is the largest of its kind in the world and is responsible for delivering military transport and ship replenishment around the globe.
The US Navy has shown countless examples of its blue-water combat capabilities and has the ability to project force onto the littoral regions of the world, engage in forward areas during peacetime, and rapidly respond to regional crises. Some examples of such are World War II, the Korean War, the Vietnam War, the Persian Gulf War, the War in Afghanistan and the Iraq War.
The United States Coast Guard, while not technically a navy, is also a blue-water naval force capable of deploying to waters throughout the world.
From green-water to blue-water
While considered to be a green-water navy, the Japan Maritime Self-Defense Force is undergoing transition to develop blue-water capabilities. It began in 1981 when Prime Minister Zenkō Suzuki put forward a new doctrine requiring the JMSDF to expand its operations by 1,000 miles for defense of the nation's sea lines of communication. To respond to the growing blue-water requirements, the JMSDF has been developing impressive capabilities, most notably the creation of destroyer flotillas centered on large helicopter destroyers (such as the Hyūga-class helicopter Carrier) and large AEGIS-equipped destroyers. The first Japanese post-WWII overseas naval air facility was established next to Djibouti-Ambouli International Airport; it supports a number of Lockheed P-3 Orion maritime patrol aircraft.
The Republic of Korea Navy also has ambitions to develop blue-water capabilities. In 2001, the South Korean President, Kim Dae-jung, announced plans to build a "Strategic Mobile Fleet". The plan includes the construction of up to three Dokdo-class amphibious assault ships, with a ski-jump for the operation of V/STOL jet fighters being considered for the second vessel currently under construction.
The Brazilian Navy is experiencing a "shift in maritime priorities" with ambitions of developing a blue-water navy. While the navy maintains a mix of capabilities enabling it to operate in the wider South Atlantic Ocean, the Brazilian government wishes to be recognized as "the leading maritime power in the Southern Hemisphere" and is seeking to develop a modern naval shipbuilding industry.
- A. ^ Professor of International Politics, Adrian Hyde-Price, highlights that in the post-Cold War era both Britain and France have re-focused their attention "towards expeditionary warfare and power projection. Power projection has always been an element of British and French military thinking given their residual overseas interests, but it has now moved centre stage."
- B. ^ Royal United Services Institute (Occasional Paper, September 2013): "As a permanent member of the UN Security Council, the independent ability to deploy a credible and powerful conventional force that enables access to most of the globe by sea is compelling. This force offers Britain the opportunity to commit political support in emerging crises to deter, prevent, coerce or – if necessary – destroy an aggressor, as envisaged in the UK’s National Security Strategy (NSS)."
- C. ^ The Royal Navy does not typically use the term blue-water navy, but rather the term expeditionary. "The Navy is always expeditionary and is able to deal with threats to our nation’s interest at range."
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