My Dad attended AF Command and Staff School at Maxwell AFB, Montgomery, AL in late 50s. I joined the Civil Air Patrol, which as the HQ location was filled with all types of surplus a/c. The students could keep current in either base or CAP aircraft, and were encouraged to fly the latter as they were easier/cheaper to maintain. The AF birds were TB-25Js, kept active as they had minimal electrics and hydraulic systems, thus easier to maintain than the Martin or Douglas twins, for example.
CAP cadets were allowed ... even encouraged ... to ride along, and those B-25 flights were popular. We'd opt for the panoramic nose seat, and most of the staff school students were WWII vets. Whether ex-fighter jocks or bomber/transport pushers, these rides were usually conducted at low level, ala Doolittle, with tours of the Tennessee valleys high on the agenda.
A few years later when I was in Naval Air, there were a few PBJs remaining, used as squadron hacks or tow target tugs. For some reason, painted a VERY dark gray-green with day glo orange wing tips and tail feathers.