Air assault in the context of Helicopter

Infantry, or infantryman are a type of soldier who specialize in ground combat, typically fighting dismounted. Historically the term was used to describe foot soldiers, i.e. those who march and fight on foot. In modern usage, the term broadly encompasses a wide variety of subspecialties, including light infantry, irregular infantry, heavy infantry, mountain infantry, motorized infantry, mechanized infantry, airborne infantry, air assault infantry, and naval infantry. Other subtypes of infantry, such as line infantry and mounted infantry, were once commonplace but fell out of favor in the 19th century with the invention of more accurate and powerful weapons.

Blitzkrieg (Lightning/Flash Warfare) is a word used to describe a combined arms surprise attack, using a rapid, overwhelming force concentration that may consist of armored and motorized or mechanized infantry formations, together with artillery, air assault, and close air support. The intent is to break through an opponent's lines of defense, dislocate the defenders, confuse the enemy by making it difficult to respond to the continuously changing front, and defeat them in a decisive Vernichtungsschlacht: a battle of annihilation.

During the interwar period, aircraft and tank technologies matured and were combined with the systematic application of the traditional German tactic of Bewegungskrieg (maneuver warfare), involving the deep penetrations and the bypassing of enemy strong points to encircle and destroy opposing forces in a Kesselschlacht (cauldron battle/battle of encirclement). During the invasion of Poland, Western journalists adopted the term blitzkrieg to describe that form of armored warfare. The term had appeared in 1935, in the German military periodical Deutsche Wehr ("German Defence"), in connection to quick or lightning warfare.

Army aviation is military aviation that is organized as a sub-branch under the command of an army, separate from a nation's dedicated air force. Army aviation units, sometimes described as air corps, are typically attached as a part of to a ground force and tasked to tactically assist its land warfare by providing close air support, rapid insertion, reconnaissance and logistics for front line ground operations. They usually comprise VTOL aircraft such as military helicopters, as well as gyrocopters, light fixed-wing attack aircraft and unmanned aerial vehicles (drones), and historically also aerostats such as military balloons and airships.

Prior to the establishment of separate national air forces, many armies had aviation units, which as the importance of aviation increased, were spun off into independent branches of the military. As the separation between a nation's ground and air forces led to a divergence of priorities, many armies sought to re-establish their own aviation branches to best serve their own organic tactical needs.

The Russian Airborne Forces (Russian: Воздушно-десантные войска России, ВДВ, romanized: Vozdushno-desantnye voyska Rossii, VDV) is the airborne separate combat arm of the Russian Armed Forces. It is a rapid response force and strategic reserve that is under the President of Russia, reporting directly to the Chief of the General Staff, and is organized into airborne and air assault units. It was formed in 1992 from divisions of the Soviet Airborne Forces that came under Russian control following the dissolution of the Soviet Union.

Troops of the Russian Airborne Forces have traditionally worn a blue beret and blue-striped telnyashka undershirt and are called desant (Russian: Десант), from the French Descente.

An amphibious assault ship is a type of amphibious warfare ship designed for spearheading amphibious incursions of marines into enemy territories during an armed conflict, via launching either naval landings or air assaults and also by providing shipborne close air support and logistics for landed friendly forces. Such a ship is typically the capital ship of a dedicated fleet known as the amphibious ready group or expeditionary strike group.

Amphibious assault ships evolved from aircraft carriers converted for specific use as helicopter carriers, which, as a result, are often mistaken for conventional fixed-wing aircraft carriers. Like the aircraft carriers they were developed from, some amphibious assault ships also support V/STOL fixed-wing aircraft, and some latest models (e.g. China's Type 076) have catapult systems for assisted takeoff of fixed-wing light aircraft such as UCAVs and have a secondary role as drone carriers. Most modern AAS designs also carry landing craft with most including a well deck, usually at the stern, to support large LCACs (hovercraft) and LCUs, which can insert both infantry and combat vehicles directly onto land.

The 82nd Airborne Division ("All American") is a United States Army airborne infantry division, that specializes in parachute assault, based in Fort Bragg, North Carolina. Currently, the division is commanded by Major General Brandon Tegtmeier.

It was first officially activated at Camp Gordon, in Georgia on 25 August 1917, though, it would later be demobilized on the 27th of May 1919, at Camp Mills, New York. During the summer of 1921, it would be reconstituted, placed into the Organized Reserves, as Headquarters, 82nd Division, and it would later be transferred to the Federal Building at Columbia, South Carolina. The 82nd Infantry Division was the second United States Army infantry-combat division of eight to deploy and return in England, and fight in France. The 82nd Infantry Division served with distinction on the Western Front in the final months of World War I. Since its initial members came from all 48 states, the division acquired the nickname All-American, which is the basis for its "AA" (pictured), on the shoulder patch. The Division took part in the Battle of Lorraine 1918, and the campaigns of St. Mihiel and Meuse-Argonne 1918.

The 1st Cavalry Division ("First Team") is a combined arms division and is one of the most decorated combat divisions of the United States Army. It is based at Fort Hood, Texas. It was formed in 1921 and served during World War II, the Korean War, the Vietnam War, the Persian Gulf War, with the Stabilization Force in Bosnia and Herzegovina, the Iraq War, the War in Afghanistan as well as Operation Freedom's Sentinel and Operation Inherent Resolve. As of July 2023, the 1st Cavalry Division is subordinate to the III Armored Corps and is commanded by Major General Thomas M. Feltey.

The unit is unique in that it has served as a cavalry division, an infantry division, an air assault division and an armored division during its existence.

The Army of the Republic of Vietnam (ARVN; Vietnamese: Lục quân Việt Nam Cộng hòa; French: Armée de la république du Viêt Nam) composed the ground forces of the South Vietnamese military from its inception in 1955 to the Fall of Saigon on 30 April 1975. Its predecessor was the ground forces of the Vietnamese National Army, established on 8 December 1950, representing Vietnam to fight in the First Indochina War against the communist Viet Minh rebels. At the ARVN's peak, an estimated 1 in 9 citizens of South Vietnam were enlisted, composed of Regular Forces and the more voluntary Regional Forces and the Popular Force militias. It is estimated to have suffered 1,394,000 casualties (killed and wounded) during the Vietnam War.

The ARVN began as a post-colonial army that was trained by and closely affiliated with the United States and had engaged in conflict since its inception. Several changes occurred throughout its lifetime, initially from a 'blocking-force' to a more modern conventional force using helicopter deployment in combat. During the American intervention in Vietnam, the ARVN was reduced to playing a defensive role with an incomplete modernisation, and transformed again following Vietnamization, it was upgeared, expanded, and reconstructed to fulfill the role of the departing American forces. By 1974, it had become much more effective with foremost counterinsurgency expert and Nixon adviser Robert Thompson noting that Regular Forces were very well-trained and second only to the American and Israeli forces in the Free World and with General Creighton Abrams remarking that 70% of units were on par with the United States Army.

Seek and destroy (also known as search and destroy, or S&D) is a military strategy which consists of inserting infantry forces into hostile territory and directing them to search and then attack enemy targets before immediately withdrawing. First used as part of counterinsurgency operations during military conflicts in Southeast Asia such as the Malayan Emergency and the Vietnam War, the strategy was developed to take advantage of new technological capabilities available to Western militaries such as the helicopter, which allowed for the adoption of new tactics like the air assault.

Primarily used in jungle warfare, the strategy was developed with asymmetric tactics in mind rather than conventional warfare. A related strategy known as clear and hold, which entailed military forces clearing an area of enemy personnel and then keeping the area clear of enemies while winning the local population's support, was developed around the same period and used alongside the search and destroy strategy. Body counts were commonly used to determine the success of the strategy, which entailed fighting a war of attrition against an insurgency.

Armoured cavalry are military units using armoured fighting vehicles (AFVs) instead of horses. They began to replace horse cavalry in the heavy shock and the light reconnaissance, skirmishing and exploitation/pursuit roles in most armies commencing after the First World War. In that succeeding capacity, the obsolete name "cavalry" was retained.

Armoured cavalry, or simply armoured units, may be primarily equipped with heavy tanks or lighter and faster light tanks, armoured cars, or even scout cars in the case of what is often known as cavalry scout. Motorized or mechanized infantry may make up a portion of the unit in some countries, supported by either motorized or self-propelled artillery, with possibly airmobile troops on helicopters included.

The Infantry of the British Army comprises 49 infantry battalions, from 19 regiments. Of these, 33 battalions are part of the Regular army and the remaining 16 a part of the Army Reserve. The British Army's Infantry takes on a variety of roles, including armoured, mechanised, air assault and light.

The People's Liberation Army Air Force Airborne Corps, also referred to as the People's Liberation Army Airborne Corps (simplified Chinese: 中国人民解放军空降兵军; traditional Chinese: 中國人民解放軍空降兵軍; pinyin: Zhōngguó Rénmín Jiěfàngjūn Kōngjiàngbīng Jūn; lit. 'Chinese People's Liberation Army Airborne Corps') is a corps grade airborne and air assault force subordinated to People's Liberation Army Air Force (PLAAF) headquarters.

Before April 2017, the Airborne Corps was called the PLAAF 15th Airborne Corps.