Airman 1st Class Dylan Edson scrubs the wheel of an F-15E Strike Eagle during a 120-day periodic cleaning March 15 at Nellis Air Force Base, Nev. The complete F-15 cleaning process takes approximately four hours with a crew of three. Airman Edson is an avionics specialist assigned to the 57th Aircraft Maintenance Squadron at Nellis. (U.S. Air Force photo/Master Sgt. Kevin J. Gruenwald)