Loudest USAF AC was the A-37 in my experience. THAT was one loud futhrmukr ! F-4’s, U2’s (Also very loud on take off)....older versions of the KC-135’s before new engines were introduced were LOUD as well.
But the A-37 was it on the meter. It hurt folks not wearing their ears. Painful.
http://en.wikipedia.org/wiki/Cessna_A-37_Dragonfly
I forgot about that loud little mother.
No kidding! Those little ol Dragonfiles?
I always thought those were pretty cool planes, never saw one fly, but I do recall seeing a few at Oshkosh...:)