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Equipment


Individual Weapons

The primary individual weapons of the Army are the M16A2/A4 assault rifle and its compact variant, the M4 carbine. Optionally, the M9 bayonet can be attached to either variant for close-quarters fighting. The 40 mm M203 grenade launcher can also be attached for additional firepower. Some soldiers whose duties require a more compact weapon, such as combat vehicle crew members, staff officers, and military police, are issued a sidearm in lieu of (or in addition to) a rifle. The most common sidearm in the U.S. Army is the 9 mm M9 pistol which is issued to the majority of combat and support units. Other, less commonly issued sidearms include the M11, used by Special Agents of the CID,  and the MK23, used by some Army Special Forces units.

In addition to these basic rifles and sidearms, many combat units' arsenals are supplemented with a variety of specialized weapons, including the M249 Squad Automatic Weapon (SAW) to provide suppressive fire at the fire-team level, the M1014 Joint Service Combat Shotgun or the Mossberg 590 Shotgun for door breaching and close-quarters combat, the M14 Rifle for long-range marksmen, and the M107 or the M24 Sniper Weapon System for snipers. Hand grenades, such as the M67 fragmentation grenade and M18 smoke grenade, are also commonly used by combat troops.

Crew-Served Weapon Systems

The Army employs various crew-served weapons (so named because they are operated by two or more soldiers in order to transport items such as spare barrels, tripods, base plates, and extra ammunition) to provide heavy firepower at ranges exceeding that of individual weapons. The M240 is the Army's standard medium general-purpose machine gun. The M240 (left-hand feed) and M240C (right-hand feed) variants are used as coaxial machine guns on the M1 Abrams tank and the M2 Bradley IFV, respectively; the M240B is the infantry variant and can be fired from a bipod or tripod if carried by hand, or employed from a pintle mount atop a vehicle. The M2 .50-caliber machine gun has been in use since 1932 in a variety of roles from infantry support to air defense. The M2 is also the primary weapon on most Stryker ACV variants and the secondary weapon system on the M1 Abrams tank. The MK 19 40mm grenade machine gun is mainly used by motorized units, such as Stryker Brigades, HMMWV-mounted cavalry scouts, and Military Police. It is commonly employed in a complementary role to the M2.

The Army uses three types of mortar for indirect fire support when heavier artillery may not be appropriate or available. The smallest of these is the 60 mm M224, normally assigned at the infantry company level. At the next higher echelon, infantry battalions are typically supported by a section of 81 mm M252 mortars. The largest mortar in the Army's inventory is the 120 mm M120/M121, usually employed by mechanized battalions, Stryker units, and cavalry troops because its size and weight require it to be transported in a tracked carrier or towed behind a truck.

Vehicles

The U.S. Army was the first in the world to achieve 100% automotive mobility, and spends a sizable portion of its military budget to maintain a diverse inventory of vehicles. The U.S. Army maintains the highest vehicle-to-soldier ratio in the world.

The Army's most common vehicle is the HMMWV (High Mobility Multipurpose Wheeled Vehicle), which is capable of serving as a cargo/troop carrier, weapons platform, and ambulance, among many other roles. The M1A2 Abrams is the Army's primary main battle tank, while the M2A3 Bradley is the standard infantry fighting vehicle. Other vehicles include the M3A3 cavalry fighting vehicle, the Stryker, and the M113 armored personnel carrier.

Artillery

The U.S. Army's principal artillery weapons are the M190A6 Paladin self-propelled howitzer and the M270A1 Multiple Launch Rocket System (MLRS), both mounted on tracked platforms and assigned to heavy mechanized units. Fire support for light infantry units is provided by towed howitzers, including the 105 mm M119A1 and the 155 mm M777 (which will replace the M198).

Aircraft

While the U.S. Army operates few fixed-wing aircraft, it operates several types of rotary-wing aircraft. These include the AH-64 Apache attack helicopter, the OH-58D Kiowa Warrior scout/light attack helicopter, the UH-60 Black Hawk utility helicopter, and the CH-47 Chinook transport helicopter. In addition, the Army's 160th Special Operations Aviation Regiment operates the MH-6/AH-6 light assault/attack helicopter, as well as highly modified versions of the Black Hawk and Chinook.