Green-water navy is terminology created to describe a naval force that is designed to operate in its nation's littoral zones and has the competency to operate in the open oceans of its surrounding region. It is a relatively new term, and has been created to better distinguish, and add nuance, between two long-standing descriptors: blue-water navy and brown-water navy.
It is a non-doctrinal naval term used in different ways. It originates with the United States Navy, who use it to refer to the portion of their fleet that specializes in offensive operations in coastal waters. Nowadays such ships rely on stealth or speed to avoid destruction by shore batteries or land-based aircraft.
The US Navy has also used the term to refer to the first phase of the expansion of China's navy into a full blue-water navy. Subsequently other authors have applied it to other national navies that can project power locally, but cannot sustain operations at range without the help of other countries. Such navies typically have amphibious ships and sometimes small aircraft carriers, which can be escorted by destroyers and frigates with some logistical support from tankers and other auxiliaries.
The elements of maritime geography are loosely defined and their meanings have changed throughout history. The US's 2010 Naval Operations Concept defines blue water as "the open ocean", green water as "coastal waters, ports and harbors", and brown water as "navigable rivers and their estuaries". Robert Rubel of the US Naval War College includes bays in his definition of brown water, and in the past US military commentators have extended brown water out to 100 nautical miles (190 km) from shore.
During the Cold War, green water denoted those areas of ocean in which naval forces might encounter land-based aircraft. The development of long-range bombers with anti-ship missiles turned most of the oceans to "green" and the term all but disappeared. After the Cold War, US amphibious task forces were sometimes referred to as the green-water navy, in contrast to the blue-water carrier battle groups. This distinction disappeared as increasing threats in coastal waters forced the amphibious ships further offshore, delivering assaults by helicopter and tiltrotor from over the horizon. This prompted the development of ships designed to operate in such waters – the Zumwalt-class destroyer and the littoral combat ships; modelling has suggested that current NATO frigates are vulnerable to swarms of 4-8 small boats in green water. Rubel has proposed redefining green water as those areas of ocean which are too dangerous for high-value units, requiring offensive power to be dispersed into smaller vessels such as submarines that can use stealth and other characteristics to survive. Under his scheme, brown water would be zones in which ocean-going units could not operate at all, including rivers, minefields, straits and other choke points.
As the preeminent blue-water navy of the early 21st century, the US Navy is able to define maritime geography in terms of offensive action in the home waters of its enemies, without being constrained by logistics. This is not true for most other navies, whose supply chains and air cover typically limit them to power projection within a few hundred kilometres of home territory. A number of countries are working on overcoming these constraints. Other authors have started to apply the term "green-water navy" to any national navy that has ocean-going ships but lacks the logistical support needed for a blue-water navy. It's often not clear what they mean, as the term is used without consistency or precision.
It should be noted that a green-water navy does not mean that the individual ships of the fleet are unable to function away from the coast or in open ocean, instead it suggests that due to logistical reasons they are unable to be deployed for lengthy periods, and must have aid from other countries to sustain long term deployments. Also the term "green-water navy" is subjective as numerous countries that do not have a true green-water navy maintain naval forces that are on par with countries that are recognized as having green-water navies. For example, the German Navy has near the same capability as the Canadian Navy but is not recognized as a true green-water navy. However, the differences between blue-water navies and brown or green-water navies is usually quite noticeable, for example the US Navy was able to quickly respond to the disappearance of Malaysia Airlines Flight 370 and continue operations in the region with relative ease even though the search area covered the Indian Ocean. On the contrary, in 2005 the then green-water navy such the Russian Navy was unable to properly respond when its AS-28 rescue vehicle became tangled in undersea cables unable to surface, relying on the blue-water Royal Navy to respond and carry out the rescue in time.
Just as nations build up naval capability some lose it, for example the Austro-Hungarian Navy was a modern green water navy of the time, however as the countries lost their coasts during World War I their navies were confiscated and their ports became parts of Italy and Yugoslavia. The Axis powers lost naval capabilities after their defeat in World War II with most of Japan's Imperial Navy and Germany's Navy being disarmed and their troop and ship numbers capped and monitored by the allies. The collapse of the USSR also brought with it the collapse of the second largest naval force in the world, and the largest submarine force in the world. Although the Russian Federation made sure to inherit the most capable ships, passing most older models to successor states, it still lacked the logistical capabilities of the Soviet Navy as it was no longer able to operate away from Russian shores for extended periods of time. Moreover, budget cuts forced large cuts in the submarine force, such as the retirements of the Typhoon-class submarine. As the Soviet Navy was built largely around submarine warfare the losses in the submarine capability have adversely affected the capability of the newly formed Russian Navy as well.
The Royal Australian Navy is well established as a green-water navy. The navy sustains a broad range of maritime operations, from the Middle East to the Pacific Ocean, often as part of international or allied coalitions. The RAN operates a modern fleet, consisting of destroyers, frigates, conventional submarines as well as an emerging amphibious and power projection capability based on the recent commissioning of HMAS Choules and the first of two new Canberra-class landing helicopter docks, HMAS Canberra.
- Amphibious capability – 27,000 tonne HMAS Canberra (to be joined by HMAS Adelaide in 2016), and 16,190 tonne HMAS Choules.
- Replenishment capability – 18,221 tonne HMAS Success and the 46,755 tonne HMAS Sirius.
The Brazilian Navy has frequently been dubbed a ‘green-water’ force by experts. The navy is primarily focused on securing the nations littorals and exclusive economic zone (EEZ), but also maintains the capacity to operate in the wider South Atlantic Ocean. Since the early 2000s, the Brazilian Navy has contributed to a number of peacekeeping and humanitarian missions.
- Carrier capability – 32,800 tonne São Paulo.
- Amphibious capability – 12,000 tonne Bahia.
- Replenishment capability – 10,000 tone Almirante Gastão Motta and the 12,889 tonne Marajó.
According to the criteria as outlined in the 2001 publication, "Leadmark: The Navy’s Strategy for 2020", the Royal Canadian Navy had met its description of a 3rd tier "Medium Global Force Projection Navy" - a green-water navy with the capacity to project force worldwide with the aid of more powerful maritime allies (e.g. Britain, France and the United States). In this context, the Canadian Navy ranked itself alongside the navies of Australia and the Netherlands. The Royal Canadian Navy operates across the globe, most recently actively supporting coalition forces in the gulf of Aden (Operation Apollo), Libya (Operation Mobile) and the Persian Gulf during Canada's ten year commitment to the war in Afghanistan.
The recent decommissioning of obsolete destroyers (designed in the 1960s) has left Canada without a credible modern air warfare capability. Combined with having no force projection/sustainment capabilities as of 2015 (such as supply, oiler, or amphibious ships), this has rendered the RCN dependent on allies. The RCN is more akin to a brown water navy until new classes commission, such as the Queenston class from 2021, Single Class Surface Combatant Project from 2025, and the proposed Amphibious Assault Ship Project in the future.
The Israeli Navy has previously deployed in offensive combat operations in the Eastern Mediterranean region, in the littoral waters of Egypt and Syria during the War of Attrition and the Yom Kippur War. It retains the strategic edge over other Navies in the Eastern Mediterranean barring the Turkish Navy, and the presence of blue-water carriers belonging to the blue-water Navies.
The Italian Navy is a green-water navy and maintains a broad spectrum of capabilities. It routinely deploys to the Indian Ocean and Persian Gulf as part of multinational anti-piracy missions such as Operation Ocean Shield and Operation Atalanta. The Italian Navy also deploys a carrier battle group in support of a number of NATO operations when needed; One such example was during operation Operation Enduring Freedom where the carrier Giuseppe Garibaldi was deployed alongside British, French and American aircraft carriers.
- Carrier capability – 27,910 tonne Cavour and the 13,850 tonne Giuseppe Garibaldi.
- Amphibious capability – three 8,000 tonne San Giorgio-class LPDs.
- Replenishment capability – 13,400 tonne Etna and two 8,000 tonne Stromboli class replenishment ships.
The Japan Maritime Self-Defense Force is considered to be a green-water navy. Overseas JMSDF deployments include participation in the Combined Task Force 150, and an additional task force in the Indian Ocean from 2009 to combat piracy in Somalia. The first postwar overseas naval air facility of Japan was established next to Djibouti-Ambouli International Airport.
- Helicopter carrier capability – two 19,000 tonne Hyūga-class helicopter destroyers and one 27,000 long ton Izumo-class helicopter destroyer.
- Amphibious capability – three 14,000 tonne Ōsumi-class tank landing ships.
- Replenishment capability – two 25,000 tonne Mashu class and three 15,000 tonne Towada class.
The Royal Netherlands Navy has been officially described as a 3rd tier "Medium Global Force Projection Navy" - or a green-water navy with the capacity to project force worldwide with the aid of more powerful maritime allies (e.g. Britain, France and the United States). In this context, the Royal Netherlands Navy ranks alongside the navies of Australia and Canada, while the USN is a 1st tier global blue-water navy and Britain and France are 2nd tier blue-water navies. For many years since the end of the Cold War, the Royal Netherlands Navy has been changing its role from national defence to overseas intervention.
- Amphibious capability – 12,750 tonne HNLMS Rotterdam and the 16,800 tonne HNLMS Johan de Witt.
- Replenishment capability – 27,800 tonne Karel Doorman (Also has amphibious capabilities).
The Republic of Korea Navy is considered to be a green-water navy. In 2011, the government authorized the building of a naval base on Jeju Island to support the new Dokdo-class amphibious assault ships, the base will also be capable of supporting joint forces with the US Navy. A ski-jump for the operation of V/STOL jet fighters is being considered for the second ship of the Dokdo class. The Korean government is considering to buy surplus Harriers as a possible interim for the F-35 Lightning II if they choose to operate VTOL aircraft at all.
- Amphibious capability – 18,800 tonne ROKS Dokdo.
- Replenishment capability – three 9,180 tonne Cheonji-class replenishment ships.
The Spanish Navy is a green-water navy and participates in joint operations with NATO and European allies around the world. The fleet has 54 commissioned ships, including; one amphibious assault ship (also used as an aircraft carrier), two amphibious transport docks, 11 frigates (of which 5 are fitted with the modern Aegis Combat System) and three conventional submarines.
- Amphibious/carrier capability – 26,000 tonne Juan Carlos I.
- Amphibious capability – two 13,815 tonne Galicia-class landing platform docks.
- Replenishment capability – 17,045 tonne SPS Patiño and the 19,500 tonne SPS Cantabria replenishment ships.
The Turkish Navy is accepted as having reached full green-water capabilities in the mid-1960s and has participated in joint operations with NATO, the Israeli Navy and the Egyptian Navy throughout the Mediterranean Sea and Red Sea. The Turkish Navy operates five conventional submarines.
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