If you can't see 'em...
U.S. Air Force Maj. Daniel Patak, 357th Fighter Squadron A-10 instructor pilot, receives an eye exam done by U.S. Air Force Tech. Sgt. Jennifer Caddell, 355th Aerospace Medicine Squadron optometry flight non-commissioned officer in charge, at Davis-Monthan Air Force Base, Ariz., May 30, 2012. The optometry flight sees about 700 to 900 patients a month for everything from eye exams to glasses fitting. (U.S. Air Force photo by Airman 1st Class Camilla A Griffin/Released)