An F-15E Strike Eagle assigned to the 335th Fighter Squadron, Seymour Johnson Air Force Base, N.C., takes off from Nellis Air Force Base, Nev., to take part in a Red Flag 15-1 training sortie over the Nevada Test and Training Range Feb. 4, 2015. Various units from around the Air Force, joint branches and coalition partners converge on Nellis three to four times a year to take part in the exercise, which puts to test the participant force’s air, space, cyber and combat search and rescue capabilities.