United States Army
The M2 heavy machine gun is generally used as a vehicle-mounted machine gun. In the same way, the 40 mm MK 19 grenade machine gun is mainly used by motorized units.
The U.S. 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 units.
Fire support for light infantry units is provided by towed howitzers, including the 105 mm M119A1 and the 155 mm M777.
The U.S. Army utilizes a variety of direct-fire rockets and missiles to provide infantry with an Anti-Armor Capability. The AT4 is an unguided projectile that can destroy armor and bunkers at ranges up to 500 meters. The FIM-92 Stinger is a shoulder-launched, heat seeking anti-aircraft missile. The FGM-148 Javelin and BGM-71 TOW are anti-tank guided missiles.

Vehicles: U.S. Army doctrine puts a premium on mechanized warfare. It fields the highest vehicle-to-soldier ratio in the world as of 2009. The army's most common vehicle is the High Mobility Multipurpose Wheeled Vehicle (HMMWV), commonly called the Humvee, which is capable of serving as a cargo/troop carrier, weapons platform and ambulance, among many other roles. While they operate a wide variety of combat support vehicles, one of the most common types centers on the family of HEMTT vehicles. The M1A2 Abrams is the army's main battle tank, while the M2A3 Bradley is the standard infantry fighting vehicle. Other vehicles include the Stryker, the M113 armored personnel carrier and multiple types of Mine Resistant Ambush Protected (MRAP) vehicles.

The U.S. Army's principal artillery weapons are the M109A7 Paladin self-propelled howitzer and the M270 multiple launch rocket system (MLRS), both mounted on tracked platforms and assigned to heavy mechanized units.

Aviation: While the United States Army Aviation Branch operates a few fixed-wing aircraft, it mainly operates several types of rotary-wing aircraft. These include the AH-64 Apache attack helicopter, the UH-60 Black Hawk utility tactical transport helicopter and the CH-47 Chinook heavy-lift transport helicopter. Restructuring plans call for reduction of 750 aircraft and from seven to four types. The Army is evaluating two fixed-wing aircraft demonstrators; ARES, and Artemis are under evaluation to replace the Guardrail ISR (Intelligence, surveillance and reconnaissance) aircraft. Under the Johnson-McConnell agreement of 1966, the Army agreed to limit its fixed-wing aviation role to administrative mission support (light unarmed aircraft which cannot operate from forward positions). For UAVs, the Army is deploying at least one company of drone MQ-1C Gray Eagles to each Active Army division.

Uniforms: The Army Combat Uniform (ACU) currently features a camouflage pattern known as Operational Camouflage Pattern (OCP); OCP replaced a pixel-based pattern known as Universal Camouflage Pattern (UCP) in 2019.
On 11 November 2018, the Army announced a new version of 'Army Greens' based on uniforms worn during World War II that will become the standard garrison service uniform. The blue Army Service Uniform will remain as the dress uniform. The Army Greens are projected to be first fielded in the summer of 2020.

Berets: The beret flash of enlisted personnel displays their distinctive unit insignia (shown above). The U.S. Army's black beret is no longer worn with the ACU for garrison duty, having been permanently replaced with the patrol cap. After years of complaints that it was not suited well for most work conditions, Army Chief of Staff General Martin Dempsey eliminated it for wear with the ACU in June 2011. Soldiers who are currently in a unit in jump status still wear berets, whether the wearer is parachute-qualified or not (maroon beret), while members of Security Force Assistance Brigades (SFABs) wear brown berets. Members of the 75th Ranger Regiment and the Airborne and Ranger Training Brigade (tan beret) and Special Forces (rifle green beret) may wear it with the Army Service Uniform for non-ceremonial functions. Unit commanders may still direct the wear of patrol caps in these units in training environments or motor pools.

Tents: The Army has relied heavily on tents to provide the various facilities needed while on deployment (Force Provider Expeditionary (FPE)).: p.146  The most common tent uses for the military are as temporary barracks (sleeping quarters), DFAC buildings (dining facilities), forward operating bases (FOBs), after-action review (AAR), tactical operations center (TOC), morale, welfare and recreation (MWR) facilities, as well as security checkpoints. Furthermore, most of these tents are set up and operated through the support of Natick Soldier Systems Center.  Each FPE contains billeting, latrines, showers, laundry and kitchen facilities for 50–150 Soldiers,: p.146  and is stored in Army Prepositioned Stocks 1, 2, 4 and 5.  This provisioning allows combatant commanders to position soldiers as required in their Area of Responsibility, within 24 to 48 hours.
The U.S. Army is beginning to use a more modern tent called the deployable rapid assembly shelter (DRASH). In 2008, DRASH became part of the Army's Standard Integrated Command Post System.

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References: 

Further reading: Bailey, Beth. America's Army: Making the All-Volunteer Force (2009) ISBN 0674035364
Bluhm, Raymond K. Jr.; Andrade, Dale; Jacobs, Bruce; Langellier, John; Newell, Clayton R.; Seelinger, Matthew (2004). U.S. Army: A Complete History (Beaux Arts ed.). Arlington County, Virginia: The Army Historical Foundation. p. 744. ISBN 978-0-88363-640-4.
Chambers, John Whiteclay, ed. The Oxford Guide to American Military History (1999), online at many libraries
Clark, J. P. Preparing for War: The Emergence of the Modern U.S. Army, 1815–1917 (Harvard UP, 2017), 336 pp.
Coffman, Edward M. The War to End All Wars: The American Military Experience in World War I (1998), a standard history
Kretchik, Walter E. U.S. Army Doctrine: From the American Revolution to the War on Terror (University Press of Kansas; 2011) 392 pages; studies military doctrine in four distinct eras: 1779–1904, 1905–1944, 1944–1962, and 1962 to the present.
Quimby, Robert S. (2012). The US Army in the War of 1812: an operational and command study. East Lansing: Michigan State University Press. ISBN 978-0-87-013947-5 – via Project MUSE.
Woodward, David R. The American Army and the First World War (Cambridge University Press, 2014). 484 pp. online review
"Desert Storm/Shield Valorous Unit Award (VUA) Citations". US Army Center of Military History. Archived from the original on 13 December 2014. Retrieved 26 December 2014.

External links: 
Official website 
Army.mil/photos – United States Army featured photos
U.S. Army Collection (Archived 2 July 2013 at the Wayback Machine) – Missouri History Museum
Finding Aids for researching the U.S. Army. Archived 9 November 2010 at the Wayback Machine (compiled by the United States Army Center of Military History).
US-militaria.com – The U.S. Army during the Second World War (archived 26 December 2012)