I'm inclined to believe him. The fact the dod IG is acting as lawyer to protect him due the gov. Officials going after him due to him just doing his job for the gov. Speaks volumes.
I'm not gonna try to tie this to some other psyop shite as there is zero evidence for that.(not a challenge to convince me, so don't).
David has followed decent routes to get his story out, provided docs to key people who've followed his requests to not release until he asked. The names he has mentioned have themselves come out under oath too, there are others he clearly can't name as they're still active/serving officials. This all dove tails to his credibility and to me is far more believable than Lazar and other similar stories.