I was in the Indiana Air Natl. Guard for a short time, back in the late 70s (before I went back on active duty with the USN), and attended the USAF Egress maintenance school at Chanute AFB.
One of the aircraft systems we studied was the F-111. Fascinating. The entire cockpit would jettison, complete with a parachute, and floats, for at-sea ejection. Amazing.
NC