An F-15 Eagle fighter jet takes off from the flightline on Nellis Air Force Base, Nev., Sept. 26, 2018. A Large Force Test Event was performed by the 53rd Test and Evaluation Group to train pilots in an environment that has a higher level of combat training with a multitude of different resources. (U.S. Air Force photo by Airman 1st Class Bryan T. Guthrie)