Thomas Kenneth `` Ken '' Mattingly II , ( born March 17 , 1936 ) is a retired American astronaut , Naval Aviator and Rear Admiral in the United States Navy who flew on the Apollo 16 , STS-4 and STS-51-C missions .
Thomas Kenneth `` Ken '' Mattingly II ( born March 17 , 1936 ) is a former NASA astronaut and a Rear Admiral in the United States Navy .