begin with the firing of a REDSTONE in April 1956, and after that 35 more of these missiles would be used in support of JUPITER  development. According to ABMA. plans, major assemblies and components or subcomponents would be procured from prime contractor production, and would be modified at the arsenal to suit a special mission. As the JUPITER prototype version was approached, the first 10 such missiles would be assembled at Redstone, too. Afterwards, through prototype number 18, the contractor would assemble the odd-numbered vehicles and Redstone the  even-numbered, and this would continue at the rate of two per month to the end of a 50-missile program. Contractor-produced missiles would be  subjected to final modifications and testing (static and otherwise), and instrumented according to the R&D needs at the Arsenal. ABMA envisioned that the first production missiles would be ready for field troops by June 1960 or earlier. Funding estimates were $43.14 million for FY  1956 and $96.52 million for FY 1957, with a total program cost estimated at $452.21 million. The accomplishment of the development goal, according to ABMA's belief, would depend on the resolution of two major problem areas. These were  engines and range facilities. Four ballistic missile programs were largely dependent on NAA's 150,000- pound-thrust engine production, and Army  negotiators were experiencing difficulty obtaining Western Development Division* approval on delivery dates to meet the Army-Navy IRBM development schedule. The second problem related to range facilities at Patrick Air Force ______________________________

*  Later renamed Air Force Ballistic Missile Division (AFBMD) and divided in 1961 into Space Systems Division (SSD) and Ballistic Systems Division (BSD).