A letter report issued by the Government Accountability Office with an abstract that begins "Congress has repeatedly expressed concerns about the pace of military operations and 10 U.S.C. 487 requires that the Department of Defense (DOD) annually report on personnel tempo--the time servicemembers spend away from home. Section 345 of the John Warner National Defense Authorization Act for Fiscal Year 2007 directed GAO to report on a number of Army and Marine Corps issues. For this report GAO addresses the extent to which (1) changes in mobilization and deployment policies have affected reserve component availability and provided an approach to meet the requirements for the global war on terrorism; and, (2) DOD, the Army, and the Marine Corps have collected, maintained, and reported complete and accurate personnel tempo data. To address these objectives, GAO analyzed data from DOD's Personnel Tempo and Contingency Tracking System databases, and interviewed agency officials."