362nd Training Squadron C-130 crew chief apprentice course students open the cargo door of an C-130 Hercules at Sheppard Air Force Base, Texas, Nov. 20, 2018. The Airmen are working on opening the door manually, which is only used during emergency situations. Each time the Airmen pull the lever on the side, it is releasing 300 psi, which slowly opens the giant door. (U.S. Air Force photo by Airman 1st Class Pedro Tenorio)