Butler was the eighth-longest-held US Prisoner of War (POW) held in North Vietnam during the Vietnam War.
Butler, a Navy pilot, who was forced to eject after a mid-air explosion on April 20, 1965 and served as a prisoner of war in North Vietnam until his release as part of Operation Homecoming in 1973.
Butler was one of the four POW's (with Carlyle "Smitty" Harris, Robert Peel, and Robert H.
Shumaker) credited with establishing the tap code.
The code enabled the prisoners to communicate with each other.
After his release Butler earned a PhD in sociology and used his communication skills to provide leadership training in military and civilian life.
Butler provided community service as President of Veterans for Peace.
In October 2019 Butler was inducted into the Oklahoma Military Hall of Fame.