convey the appropriate message to aircrews. The DZST must have radio contact with the drop aircraft for several types of drops. The DZSTL must also evaluate the condition of the DZ before the drop to ensure that it is suitable for a safe personnel landing, as well as to ensure that airdropped equipment can be recovered. The DZSTL places personnel, vehicles, and support equipment so they are not endangered by the airdrop. (Possible parachute malfunction should be considered when determining placement.) He also ensures the DZ is clear of all personnel and equipment not required to support the airdrop no later than 10 minutes before the estimated time over target. The DZSTL is responsible for the operation of all visual acquisition aids and electronic equipment, such as smoke, flares, signal lights, and radios. He ensures that this equipment is not used by untrained personnel. If conditions are not safe for a successful airdrop, the DZSTL uses pre-briefed visual signals or radio communications to ensure that the no-drop condition is made known to the incoming aircraft. The DZSO is a key member of what is referred to as a Drop Zone Support Team. The difference in the required duties of the DZSO as opposed to the DZSTL is tied to whether or not the mission is supported by an Air Force Combat Control Team. Jumpmaster training The U.S. Army Jumpmaster School at Fort Benning, Georgia and the U.S. Army Advanced Airborne School at Fort Bragg, North Carolina are the U.S. Army's primary schools for training jumpmasters across the U.S. Department of Defense. References External links ArmyParatrooper.org Paratroopers Military supporting service occupations Airborne warfare Military parachuting