HALO - High Altitude-Low Opening also known as Military Free Fall (MFF).
HAHO - High Altitude-High Opening
A HAHO jump is a special type of military-style parachute jump performed when an aircraft is unable to fly above enemy skies without creating a threat to jumpers or the plane. Jumpers exit at high altitude, quickly pull chutes, and fly under canopy to the designated target.
HALO is a military-style, High Altitude, Low Open parachute jump. At 30,000 feet, the temperature is somewhere around 25 to 35 degrees below zero. Without oxygen, you can expect to be usefully conscious about 30 seconds.
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