Dusk Detection Air Force explosive ordnance disposal technicians use a metal detector to assess a simulated potential threat during nighttime counter-improvised explosive device training at Al Udeid Air Base, Qatar, Oct. 21, 2017. Air National Guard photo by Staff Sgt. Patrick Evenson SHARE: Download: Full Size (3.12 MB) Credit: Staff Sgt. Patrick Evenson VIRIN: 171021-Z-YI114-077C.JPG Photo Gallery