The Navy has over 150 non-nuclear surface ships that it repairs, maintains, and modernizes using privately owned shipyards. The Navy concluded in 2010 that readiness of the surface ship force was below acceptable levels. This, in addition to the concerns of leadership about cost and schedule growth, led to a revised readiness strategy and, in 2015, introduction of a new contracting strategy for ship repair, referred to as MAC-MO. House Report 114-102 accompanying the fiscal year 2016 National Defense Authorization Act included a provision for GAO to review the Navy's implementation of the MAC-MO strategy. This report assesses (1) the potential benefits of the MAC-MO contracting strategy, (2) process changes the Navy has made to address any challenges and to capitalize on anticipated benefits, and (3) how the strategy will potentially affect the Navy's ship repair industrial base. GAO analyzed the Navy's acquisition planning documentation, lessons learned, and contracts. GAO interviewed Navy officials and visited regional maintenance centers in Norfolk, Va.; San Diego, Calif.; and Mayport, Fla. GAO also interviewed previous and prospective Navy ship maintenance contractors.