This briefing is in response to section 343 (a) of The National Defense Authorization Act for Fiscal Year 2010 (Pub. L. No. 111-84). The Act requires the Comptroller General to provide a report on the sustainment strategy for the AV-8B Harrier aircraft and provide the results to the congressional defense committees no later than 180 days after the enactment of the Act. Because the AV-8B Harrier aircraft sustainment strategy does not detail how the Navy will measure the execution of all the responsibilities of the organizations accountable for coordinating AV-8B maintenance events, the Single Process Owners; we are recommending that the Navy develop and implement metrics for evaluating the execution of all the stated Single Process Owners' responsibilities.