Technically turbofans are jet engines, just a different kind. I've heard everything up close except for the b52 and the sr71 (even though thats what I always wanted to fly), and honestly I gotta say the meanest sounding one to me is the F4. I've heard 22s, 15s, and 16s all day and yes they are bad ass as hell, but something about those two huge GE turbojets just sounded so freakin sweet.
Wish I could have seen the fly-over, I thought I heard a non-commercial today when I was on campus but didn't see anything.
And yes, the military can break the sound barrier over mainland, but they usually require a certain elevation and a certain distance from residential. But if they need to haul ass, they'll do what they gotta do