Military term for the person in charge of paratroopers as they exit an aircraft
... toward the exit of an 
aircraft in flight, when the JUMPMASTER directs the paratroopers .... tend to incur 
a malfunction when they deploy their parachute; a conscious person falling .... 
cherry blast : Slang for someone's first parachute jump, whether civilian or military
;... [DOC] [TLE] United States Army Airborne School - Wikipedia [PAR] The United States Army Airborne School  widely known as Jump School  
conducts the basic paratrooper (military parachutist) training for the United States 
armed forces.