The RTV-A-3 NATIV was an experimental missile developed by North American Aviation for the United States Air Force in the late 1940s to test and evaluate guided missile technologies. The North American Test Instrumentation Vehicle (NATIV) was developed as part of the MX-770 program which was created towards the end of WWII with the intent of developing a long range missile. Conception and design Exactly what the type of the missile, its range and payload were all changing during the period from the mid-1940s to early 1950s. One major consideration was that limited funds meant that an extensive build / test / modify process such as that used by the Germans in developing the V-2 was not possible. Due to budgetary restraints a great deal more information had to be readily derived from each of far fewer flights. On the RTV-A-2 (MX-774), a camera recorded the results displayed upon an instrument panel. Both the number of parameters recorded and the survivability of the film record were limited. Therefore, dependence upon the intact recovery of this camera was not desirable. NATIV was designed to utilize the then-new FM/FM telemetry to send a number of channels of data in real time during the flight of the missile. Development of the NATIV was to contribute to design of the XSSM-A-4 Navajo missile. The design of the NATIV was influenced by the German Wasserfall which was aerodynamically proven in the speed range to be studied. The shape of the missile and its fins were utilized though at 52% of size of the Wasserfall. The exhaust vanes used for low velocity control of Wasserfall were omitted and preliminary guidance was provided by a launch tower similar to that used by the RTV-A-2 and Aerobee (RTV-N-8 / RTV-A-1)rockets. The engine for NATIV was a development of the WAC Corporal engine. Built by Aerojet, the 21AL2600 engine was later used by the early Aerobee. With the creation of the United States Air Force in September 1947, Project MX-770 was assigned to the new Air Force, while ballistic missiles were assigned to the Army Ground Forces / Army Service Forces as advanced artillery. Funding The NATIV program was poorly funded. Jeff Schmidt, a guidance engineer on the project, commented upon the difficulties of an underfunded ad hoc program being conducted at a remote location. "It had become apparent that the instrumentation program was underfunded and behind schedule .