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Through V/STOL, Helicopter and World War II

The main advantage of airborne forces is their ability to be deployed into combat zones without a land passage, as long as the airspace is accessible. Formations of airborne forces are limited only by the number and size of their transport aircraft; a sizeable force can appear "out of the sky" behind enemy lines in merely hours if not minutes, an action known as vertical envelopment.

Airborne forces typically lack enough supplies for prolonged combat and so they are used for establishing an airhead to bring in larger forces before carrying out other combat objectives. Some infantry fighting vehicles have also been modified for paradropping with infantry to provide heavier firepower.

Protocol I of the Geneva Conventions protects parachutists in distress, but not airborne troops. Their necessarily-slow descent causes paratroopers to be vulnerable to anti-air fire from ground defenders, but combat jumps are at low altitude (400–500 ft) and normally carried out a short distance away (or directly on if lightly defended) from the target area at night. Airborne operations are also particularly sensitive to weather conditions, which can be dangerous to both the paratroopers and airlifters, and so extensive planning is critical to the success of an airborne operation.

Advances in VTOL technologies (helicopter and tiltrotor) since World War II have brought increased flexibility, and air assaults have largely been the preferred method of insertion for recent conflicts, but airborne insertion is still maintained as a rapid response capability to get troops on the ground anywhere in the world within hours for a variety of missions.

Early history

Benjamin Franklin envisioned the danger of airborne attack in 1784, only a few months after the first manned flight in a hot air balloon:

Five Thousand Balloons capable of raising two Men each, would not cost more than Five Ships of the Line: And where is the Prince who can afford so to cover his Country with Troops for its Defense, as that Ten Thousand Men descending from the Clouds, might not in many Places do an infinite deal of Mischief, before a Force could be brought together to repel them?

An early modern operation was first envisioned by Winston Churchill who proposed the creation of an airborne force to assault behind the German lines in 1917 during the First World War. Later in late 1918. Major Lewis H. Brereton and his superior Brigadier General Billy Mitchell suggested dropping elements of the U.S. 1st Division behind German lines near Metz. The operation was planned for February 1919 but the war ended before the attack could be seriously planned. Mitchell conceived that US troops could be rapidly trained to utilize parachutes and drop from converted bombers to land behind Metz in synchronisation with a planned infantry offensive.

Following the war, the United States Army Air Service experimented with the concept of carrying troops on the wings of aircraft, with them pulled off by the opening of their parachutes. The first true paratroop drop was by Italy in November 1927. Within a few years, several battalions were raised and eventually formed into two 185th Infantry Division "Folgore" and 184th Infantry Division "Nembo" divisions. Although they later fought with distinction in World War II, they were never used in a parachute drop. Men drawn from the Italian parachute forces were dropped in a special-forces operation in North Africa in 1943 in an attempt to destroy parked aircraft of the United States Army Air Forces.

At about the same time, the Soviet Union was also experimenting with the idea, planning to drop entire units complete with vehicles and light tanks. To help train enough experienced jumpers, parachute clubs were organized with the aim of transferring into the armed forces if needed. Planning progressed to the point that Corps-size drops were demonstrated to foreign observers, including the British Military Attaché Archibald Wavell, in the Kiev military district maneuvers of 1935.

One of the observing parties, Nazi Germany, was particularly interested. In 1936, Major F. W. Immans was ordered to set up a parachute school at Stendal (Borstel), and was allocated a number of Junkers Ju 52 aircraft to train on. The military had already purchased large numbers of Junkers Ju 52s which were slightly modified for use as paratroop transports in addition to their other duties. The first training class was known as Ausbildungskommando Immans. They commenced the first course on 3 May 1936.

Other nations, including Argentina, Peru, Japan, France and Poland also organized airborne units around this time. France became the first nation to organize women in an airborne unit, recruiting 200 nurses who during peacetime would parachute into natural disaster zones but also as reservists who would be a uniformed medical unit during wartime.

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