Orlando Vasquez, Mission 1st Support Services contractor, performs pre-flight checks with U.S. Air Force Capt. Chelsea, 71st Fighter Training Squadron T-38 Talon adversary air mission commander, at Joint Base Langley-Eustis, Va., Dec. 6, 2016. Members of the Mission 1st Support Services are crew chiefs, who also have additional roles such as electricians, structural mechanics and environmental. (U.S. Air Force photo by Airman 1st Class Tristan Biese)