U.S. Air Force Staff Sgt. Zachary Dunn, 192nd Fighter Wing low observable aircraft structures technician, picks at radar absorbent material from an F-22 Raptor during Red Flag 17-1 at Nellis Air Force Base, Nev., Feb. 3, 2017. The absorbent material aids in the Raptor’s low observability, a factor that makes it a stealth fighter aircraft. (U.S. Air Force photo by Staff Sgt. Natasha Stannard)