DOVER AIR FORCE BASE, Del. -- Air Force Reservist Maj. Stephanie Holt, 512th Aerospace Medicine Squadron chief of optometry, ensures Tech. Sgt. Joseph Smith-Basinger, 512th Aircraft Maintenance Squadron crew chief, meets the vision criteria to cross-train into a flight engineer position March 7 during the 512th Airlift Wing Unit Training Assembly. Major Holt is an optometrist at the Eye Institute of Salus University and works part-time for two retinal specialists in Philadelphia. The optometry department examines patient's vision acuity, depth perception and color vision. (U.S. Air Force photo/Senior Airman Andria J. Allmond)