U.S. Air Force Reserve Airmen assigned to the 913th Maintenance Squadron prepare to connect a power cord to a receptacle on a C-130J Super Hercules at Keesler Air Force Base, Miss., June 3, 2017. Power is supplied to the aircraft by generators so maintainers can run checks on the electrical environmental systems. (U.S. Air Force photo by Master Sgt. Jeff Walston/Released)