Melvin Mullis served as a 3rd class petty officer in the Navy during WWII. He served aboard the USS Yaupon where he worked on damage control for the ship. He did not see any combat and returned to the States on Christmas Eve after two months aboard the ship. He said he couldn't communicate with his family at all because "mail doesn't run in the center of the ocean."
Larry Richardson served in the Navy 1968-74 aboard the USS Keppler. He was an E5 2nd class when he left the army and was a working as a boiler technician, making the steam that would allow the engine to run. His ship came and left out of Pearl Harbor.
Walter R. Hamilton enlisted in the Navy and served four years. He was trained in maintenance for airplanes and fighter-jets. He served a six month tour of the pacific following the end of the Korean War.