Retired as a pipe fitter and older than dirt. Still kicking, just not as high as I once was. USAF from 1967 to 1971 Loaded bombs, rockets, missiles & 20 MM cannons on F-4 aircraft during V. Nam. The cannons had six rotating barrels and could fire 6000 rounds per minute or 100 rounds per second. Pilots needed all the lead they could get per second for dog fights.