Assistant Secretary of Defense for Health Affairs Thomas McCaffery observes the beginning stages of a refractive surgery at the Warfighter Refractive Surgery Center at Joint Base San Antonio-Lackland, Oct. 21. The center is the largest refractive training program in the Department of Defense and has trained and certified more than 150 refractive surgeons. (Photo by Air Force Staff Sgt. Amanda Stanford, 59th Medical Wing.)