Master Sgt. Rebecca Jackonic, 758th Airlift Squadron flight engineer, performs preflight checks on all the switches and gages that will be used inflight by the pilot and non-flying pilot, Feb. 8, 2015, here. Preflight checks are a vital part of keeping airdrop missions safe and on schedule. (U.S. Air Force photo by Staff Sgt. Justyne Obeldobel)