The military services are collectively responsible for maintaining more real property than any other entity in the world-more than 320,000 buildings (with about 2.1 billion square feet), tens of thousands of miles of roads, and 1.1 million square yards of pavement (such as runways). The replacement value of this property is more than $500 billion. The annual maintenance and repair budget for these facilities has averaged about $5 billion for each of the past 4 years (fiscal years 1996-1999). Separate accounts are used to fund maintenance and repair of family housing, many industrial-related facilities, and many military medical facilities. Congressional concerns about DOD's and the services' management of real property maintenance are long-standing, going back to the l950's. In the past decade, these concerns have focused in part on the services' reported repair backlog, which increased 64 percent from 1992 through 1998, despite the Congress' net addition of more than $800 million to the services' maintenance accounts during this period to try to eliminate the backlog.