21 September 1956 – Grumman company test pilot Tom Attridge shoots himself down in a Grumman F-11F Tiger, BuNo 138260, during a Mach 1.0 20 degree dive from 22,000 feet. Tom fires two bursts from the fighter’s 20mm cannon during the descent, and as he reaches 7,000 feet (2,100 m) the jet is struck multiple