NF-104A details Three aircraft were modified from existing Lockheed F-104A airframes and served with the Aerospace Research Pilots School between 1963 and 1971, the modifications included a small supplementary rocket engine and a reaction control system for flight in the upper atmosphere. The wingspan of the NF-104A was increased by adding wingtip extensions to the existing platform. This modification was needed to house the RCS roll control thrusters and would also decrease the type's wing loading. copyright © Peitzmeier archive