He was the oldest man to walk on the Moon, & the only World War II veteran
He was selected as one 
of the "Mercury Seven" group of military test pilots ... On October 29, 1998, while 
still a sitting senator, he became the oldest person to fly in space, and the only 
one to... [DOC] [TLE] 5 Famous Astronauts who Served in the Military - VeteranAid.org [PAR] Jul 7, 2016 ... Arguably one of the world's most famous astronauts, Neil Armstrong was ...