NASA veterans shed light on 50 years of accomplishments and challenges

[img_assist|nid=6810|title=Click on photo to enlarge or download|desc=John Glenn climbs into the capsule of Friendship 7 on Feb. 20, 1962, to begin the first American manned mission to orbit Earth. NASA Photo|link=popup|align=right|width=640|height=439]When Apollo 7 astronaut Walter Cunningham was growing up during World War II, he saw a movie called "Helldivers of the Navy" that changed his life.