Rec. 1: The DoD OIG recommended that the Program Executive Officer, Ground Combat Systems, in collaboration with Anniston Army Depot officials, conduct a review as required by DoD Instruction 4151.21, "Public-Private Partnerships for Product Support," of the M1 Abrams and Stryker Family of Vehicles workshare public-private partnerships with General Dynamics Land Systems. During the review, the Program Executive Officer, Ground Combat Systems should identify and document benefits of the partnerships, establish metrics to measure the benefits, and implement a process to monitor the benefits. The Program Executive Officer, Ground Combat Systems should also consider potential changes to the public-private partnership during the review and implement those that maximize benefits for the Army.