The Military Departments assess cost, schedule, deployment needs, and design stability factors to determine if Government (organic) maintenance or contractor maintenance will be used to support a weapon system. Based on their assessments, the Military Departments decide whether to transfer maintenance from contractors to organic depots for many of the components on each weapon system. There are, however, some components and weapon systems that are planned to be repaired by contractors during their entire lives because the Military Departments determine that contractor support is the most efficient and effective support plan. Once a Military Department decides to repair a weapon system, or one of its selected components, at an organic depot, the Military Department establishes repair capability as soon as possible. The transition of a weapon system from contractor to organic maintenance normally occurs in phases with the organic depot incrementally assuming a larger proportion of the work load as design of the component stabilizes and repair capability is established. To facilitate an orderly and effective transition from contractor to organic support and to ensure transition of work load as soon as possible after organic capability is established, the Military Departments require that transition plans be developed for each weapon system. Transition plans establish the milestones for each phase of the transition and the actions required to achieve transition. Between the fielding of a weapon system's components and certification that the organic repair facility can repair those components, the Military Departments rely on contractors to repair components. The Military Departments procured contractor support totaling about $200 million during FY 1989 for the three weapon systems we reviewed.