From Defense News:

The milestone — something the Defense Department and the other armed services still have not achieved — comes after almost two decades of trying to prepare the Corps’ records and several failed audits along the way.

During this two-year audit, the Marine Corps had independent third-party auditors from Ernst and Young vet the value of all its assets listed on financial statements. The Corps also had to prove that every single item existed and was where the service said it was.