This document tracks the changes to the appearance of the two Boeing B-52 Stratofortresses that were modified to carry and launch the North American X-15 rocket planes. The two NB-52s went on to launch the X-15A-2, Northrop HL-10, Northrop M2-F2, and Martin-Marietta X-24A. The NB-52A retired in October 1969, but the NB-52B soldiered on until November 2004, launching a wide variety of unmanned research vehicles and parachute test devices. The appearance of the NB-52s changed many times over the years. These changes are illustrated in this document. There are fourten sets of illustrations for the NB-52A and eighteen sets of illustrations for the NB-52B. The Stratofortress motherships are popular subjects for modelers. Their special missions capture the imagination. The liberal application of DayGlo orange, DayGlo red, and yellow makes them a couple of the most colorful B-52s. This document will help modelers to reproduce the correct appearance of either Stratofortress for any particular mission.