Airmen from the 54th Aircraft Maintenance Squadron prepare an F-16 Fighting Falcon for aircraft purification Nov. 4 at Holloman Air Force Base, N.M. Aircraft purification is the process in which water, air and contaminant particles are removed from the hydraulic fluid in an aircraft. Holloman Airmen performed this process for the first time on an F-16 on Nov. 3. (U.S. Air Force photo/Airman 1st Class Emily A. Kenney)