If you’re interested in the kind of aircraft that most often appear in my novels, do yourself a favor and visit the Air Mobility Command Museum. You’ll find it at Dover Air Force Base, Delaware. You won’t need a military ID to see it, because it’s located outside the operational area of the base. (It’s free, too, though they graciously accept donations.)
The museum volunteers are veterans, many of whom have logged thousands of hours in the aircraft you’ll visit. Just hearing those veterans’ stories makes the visit worth the drive. The museum’s planes include the C-130, C-141, C-124, KC-135, C-121, C-133, and the B-17. The list goes on much longer.