High Altitude Low Opening (HALO) Freefall Parachuting

High Altitude Low Opening (HALO) is a method of delivering paratroopers, equipment, and supplies from a high altitude via free-fall parachute. It is also known as Military Free Fall (MFF).

The parachutist opens his parachute at a low altitude after free-falling from high altitudes between 15,000 feet (4,600 m) and 35,000 feet (11,000 m).

In the UK MFF developed from sports parachuting from the late 1950s onwards and a full explanation of its genesis can be read in the Joint Services Free Fall Trials Team (JSFTT) section.

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