Staff Sgt. David Felkins, 366th Civil Engineer Squadron explosives ordinance disposal technician, teaches an Airman how to conduct a time fuse burn test, Jan. 23, 2020, at Mountain Home Air Force Base, Idaho. These fuses are used by explosive ordinance disposal technicians to build counter-detonation explosives downrange. (U.S. Air Force photo by Senior Airman Tyrell Hall)