DIRECT contended that the requirement to develop 5-segment SRBs and the J-2X upper stage engine for Ares I in order to fly the first Orion was directly responsible for the delays in schedule and the comparatively high development costs. All-new manufacturing at the Michoud Assembly Facility and launch facilities at Kennedy Space Center would also be required for Ares I. In contrast, DIRECT proposed to reuse the existing 4-segment fully human rated Space Shuttle Solid Rocket Booster and Space Shuttle Main Engine. DIRECT also proposed reuse of existing manufacturing to build a modified variant of the existing Space Shuttle External Tank. Only moderate modifications would be required at Kennedy Space Center to enable launches. DIRECT's proposal for a single launch vehicle were intended to remove the program risks associated with the possible cancellation of the Ares V launcher due to budgetary constraints.