A US Army report to Congress says about one in four grave sites at Arlington National Cemetery may contain discrepancies.
A review of nearly 260,000 headstones was ordered last year after it emerged graves that had been misplaced.
The BBC reports the review found that internal records do not match with 64,230 headstones.
There were misspelled names, and incorrect ranks and dates of birth and death.
But no new evidence of people buried in the wrong plots was found in the report. The cemetery is 150 years old.
The Army compared information on every headstone to internal records.
Many of the errors amount to a mistake on the cemetery paperwork, rather than the headstone.