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Susan Walsh, Associated Press
Army National Cemeteries Program Executive Director Kathryn Condon prepares to testify on Capitol Hill in Washington, Wednesday, Jan. 25, 2012, before the Senate Homeland Security and Governmental Affairs subcommittee hearing to examine contract management at Arlington National Cemetery. (AP Photo/Susan Walsh)

WASHINGTON — Arlington National Cemetery is a lot more full than anyone knew.

At a senate hearing Wednesday, cemetery executive director Kathryn Condon testified that more than 400,000 individuals are interred there. That's 20 percent more than previous estimates of about 330,000.

The new estimate comes as part of a meticulous grave-by-grave count is under way at the cemetery following reports in 2010 of misplaced remains.

Condon expects to have an exact count later this year. A formal count had never been done before.

The new estimate does not affect the cemetery's capacity. Officials have been looking for ways to extend Arlington's lifespan as available space for burials dwindles.