The authors compared the performance of several systems--particularly DRIVE (Distribution and Repair in Variable Environments) and the Air Force"s D028--for central stock leveling. The authors conclude that the Air Force should use desktop DRIVE, a PC-based implementation of DRIVE developed by the Dynamics Research Corporation, but only when it is used in execution to prioritize component repairs and allocate serviceable assets. This approach determines stock levels as well as well-known optimization models currently in use, either for determining aircraft recoverable spare requirements or for central stock leveling, and will provide consistency between asset allocations recommended by Desktop DRIVE in execution and base due-ins.