The refractive surgical procedures of the eye, PRK and LASIK, are allowed, providing at least 1 year has passed since the date of the procedure with no permanent adverse after effects.
•
An additional four (Elliot See, Charles Bassett, Theodore Freeman, and Clifton Williams) were killed in T-38 plane crashes during training for space flight during the Gemini and Apollo programs.
NASA | United States Marine Corps | United States Army Corps of Engineers | Peace Corps | astronaut | Royal Flying Corps | United States Army Air Corps | Royal Army Medical Corps | Civilian Conservation Corps | Army Air Corps | Corps of Engineers | Reserve Officers' Training Corps | Marine Corps Recruit Depot Parris Island | Commandant of the Marine Corps | Royal Army Service Corps | Royal Army Ordnance Corps | Marine Corps Base Quantico | Royal Armoured Corps | Judge Advocate General's Corps | Corps | Astronaut | Air Training Corps | Marine Corps Recruit Depot San Diego | Marine Corps Base Camp Lejeune | King's Royal Rifle Corps | Medical Service Corps | Marine Corps Base Hawaii | Australian and New Zealand Army Corps | Army Air Corps (United Kingdom) | Second Corps |
Another, Neil Armstrong, became a NASA astronaut in 1962 and became the first person to walk on the Moon in 1969.