At the start of his tenure, Rumsfeld said that the DoD couldn't account for about $2T dollars, so regardless of whether $21T seems plausible, this (first ever!) audit is long overdue.
Those two trillion dollars Pentagon could not account for where for just one year or a longer period? I remember that. It happened right before 9/11 so it was forgotten after the terrorist attack but Rumsfeld went on record saying all that money was missing. Could it be corruption in military is so widespread that we talk about trillions of dollars being siphoned away?
Yeah, and this was announced right before Sep 11, 2001. Funny how it never got more attention...