362nd TRS crew chief course
Airman Wesley Boykin, 362nd Training Squadron crew chief apprentice course student, removes and installs the liquid oxygen converter on an A-10 Thunderbolt at Sheppard Air Force Base, Texas, Jan. 23, 2018. The liquid oxygen converter holds all the oxygen for the pilot while in flight. Boykin is in block four of six and scheduled to graduate March 9. (U.S. Air Force photo by Alan R. Quevy)