U.S. Air Force Staff Sgt. Daniel Corral, 633rd Security Forces Squadron training instructor, performs a timed ammunition box lift at Joint Base Langley-Eustis, Va., April 28, 2017. Corral and members of the 633rd SFS Emergency Services Team developed and tested a qualification course which will be used for future candidates who want to join the EST. (U.S. Air Force photo/Senior Airman Derek Seifert)