The 111's, the first jet I worked on, they showed are from the 20th FW when they were based out of RAF Upper Heyford, UK. My old stomping ground when I was new to the AF. We had the E models and the EF-111A's which weren't the fastest flying 111's. The FB's that I worked on at Plattsburgh AFB were faster, but not by much. A crew chief friend of mine said that he say a mach meter stuck at 3.2 but figures the plane was in a dive when it hit that speed.