Combat endurance is the time that a military system or unit can remain in

combat Combat (French for ''fight'') is a purposeful violent conflict meant to physically harm or kill the opposition. Combat may be armed (using weapons) or unarmed ( not using weapons). Combat is sometimes resorted to as a method of self-defense, o ...

before having to withdraw due to depleted resources. The definition is not precise; for example the combat endurance of an

aircraft An aircraft is a vehicle that is able to fly by gaining support from the air. It counters the force of gravity by using either static lift or by using the dynamic lift of an airfoil, or in a few cases the downward thrust from jet engines. ...

, without qualification, is usually the time the aircraft can remain at an

altitude Altitude or height (also sometimes known as depth) is a distance measurement, usually in the vertical or "up" direction, between a reference datum and a point or object. The exact definition and reference datum varies according to the context ...

suitable for combat, but in a particular theatre of operations it is the time it can remain in the area of combat. During the

Battle of Britain The Battle of Britain, also known as the Air Battle for England (german: die Luftschlacht um England), was a military campaign of the Second World War, in which the Royal Air Force (RAF) and the Fleet Air Arm (FAA) of the Royal Navy defended ...

, for example, the combat endurance of German fighters was the time they could remain over

Britain Britain most often refers to: * The United Kingdom, a sovereign state in Europe comprising the island of Great Britain, the north-eastern part of the island of Ireland and many smaller islands * Great Britain, the largest island in the United King ...

, i.e., their inherent (

endurance Endurance (also related to sufferance, resilience, constitution, fortitude, and hardiness) is the ability of an organism to exert itself and remain active for a long period of time, as well as its ability to resist, withstand, recover from an ...

)less the time to travel from their base to Britain, and the time to return—about 15 minutes. In addition to fuel the expenditure of ammunition and other consumables will reduce combat endurance, for example the limiting factors for a nuclear attack submarine are its torpedoes or for a nuclear aircraft carrier aviation fuel and aircraft munitions.

Military units Military organization or military organisation is the structuring of the armed forces of a state so as to offer such military capability as a national defense policy may require. In some countries paramilitary forces are included in a natio ...

will have a combat endurance, how long they can stay in the field for, measured by how long its logistics train can keep its component subunits supplied with food, fuel, ammunition and spare parts etc. The

United States Department of Defense The United States Department of Defense (DoD, USDOD or DOD) is an executive branch department of the federal government charged with coordinating and supervising all agencies and functions of the government directly related to national secur ...

and

NATO The North Atlantic Treaty Organization (NATO, ; french: Organisation du traité de l'Atlantique nord, ), also called the North Atlantic Alliance, is an intergovernmental military alliance between 30 member states – 28 European and two No ...

define endurance as "the time an aircraft can continue flying, or a ground vehicle or ship can continue operating, under specified conditions, e.g., without refueling." Combat endurance training is also used for a system of

physical training Physical fitness is a state of health and well-being and, more specifically, the ability to perform aspects of sports, occupations and daily activities. Physical fitness is generally achieved through proper nutrition, moderate-vigorous physical ...

associated with

stamina Stamina may refer to: Biology and healthcare * Endurance, the ability of an organism to exert itself and remain active for a long period of time, as well as its ability to resist, withstand, recover from, and have immunity to trauma, wounds, or fat ...

Improving combat endurance

The improvements of combat endurance are largely concerned with better efficiency to the current platforms and they aim to bridge the gap between the resources available today and the future. Technology, therefore, dominates this field and one specific aspect that demonstrates this involves the technologies that enhance

fuel efficiency Fuel efficiency is a form of thermal efficiency, meaning the ratio of effort to result of a process that converts chemical potential energy contained in a carrier (fuel) into kinetic energy or work. Overall fuel efficiency may vary per device, ...

. There are three improvement categories focused on this area: * fundamental: involves new vehicle configurations that affect overall aerodynamics and structural efficiency; new propulsion architecture and over the longer term fuels * major subsystem increments: engine improvements and use of new structural materials * small component evolution: use of more efficient generators, thrusters, and material substitution, among others The U.S. Department of Defense identified three breakthrough technologies that could significantly improve its capabilities and combat endurance and these are: 1) blended wing body for fixed-wing, heavy-lift aircraft; 2) variable speed tilt rotor for vertical lift aircraft; and, 3) blast bucket design concept for light armor ground vehicles.

References

{{DEFAULTSORT:Combat Endurance Combat Fighter aircraft Exercise physiology Military planning