The Department of Defense, one of the largest federal agencies, has admitted to losing track of over $220 billion worth of equipment it gave out to military contractors, according to a Government Accountability Office report.

The DoD frequently contracts with third parties for a host of services such as intelligence gathering, weapons development, and transportation. Sometimes, the DoD will loan out government property to these contractors, including ammunition, missiles, and torpedoes, to help the contractors accomplish their mission goals. Unfortunately, the DoD has done a poor job of keeping track of these assets.

The report found that the $220 billion in equipment the agency has lost track of is likely “significantly understated.” The report also cites lost equipment as one of the reasons the DoD can’t balance its books.