The B-52 "A" built only 3 pieces. None of the B-52As ever entered operational service with the USAF. 52-0003 was modified to NB-52A standard and used as a "mother ship" for the X-15.
These specialised aircraft were responsible for the sometimes hazardous Volant DEW resupply mission to DEW-Line radar stations on the Alaska, Canada and Greenland ice cap.
This KC-135A have interested history. Manufactured in 1957, used in experiments to determine effects of Aurora Borealis on radio communications in 1957/58, later used in nuclear weapon test programs, wfu to AMARC 28.04.1993 after TT 14062 hours.
One of three built EC-135J Silver Dollar. Heavily-modified as an electronic warfare aircraft and command post at nuclear conflict. Its successor is E-4B.
The EC-130Q was used to communicate with US Navy submarines while they remained submerged. To achieve this a 30,000ft antenna was spooled out behind the aircraft to transfer data with very low frequency (VLF) signals that could penetrate sea water.
The first Boeing YC-14 (72-1873) entrant into the USAF's Advanced Medium STOL Transport (AMST) competition, which aimed to replace the C-130 Hercules as the USAF's standard STOL tactical transport.