Office of Inspector General – United States Department of Defense – DoD IG Testimony.
I saw a tweet today from @DoD_IG touting the availability of written testimony to Congress going back to 1998.
It’s not everything you might wish for but eighteen years of testimony is a good start.
Playing with the interface a bit, I found that reports by the DoD IG date back to January of 1990.
If you are interested in the recurrent patterns of fraud in DoD operations, this is certainly a good starting place.