U.S Marine Pfc. Brad A. Clark inspects the rigged aerial delivery systems of Joint Precision Airdrops during a Weapons and Training Instructor Course March 30, 2017, at Marine Corps Air Station Yuma, Ariz. Clark is an airborne delivery specialist with 2nd Transportation Support Battalion, 2nd Marine Logistics Group. The JPADS uses a GPS system and a modular autonomous guidance unit to get to their targeted drop zones. - U.S Marine Pfc. Brad A. Clark inspects the rigged aerial delivery systems of Joint Precision Airdrops during a Weapons and Training Instructor Course March 30, 2017, at Marine Corps Air Station Yuma, Ariz. Clark is an airborne delivery specialist with 2nd Transportation Support Battalion, 2nd Marine Logistics Group. The JPADS uses a GPS system and a modular autonomous guidance unit to get to their targeted drop zones.