The US military is never candid about it's mistakes.
It denies, blames, conceals and what little the US public ever finds out is skewed, spun and distorted.
The Pat Tillman story, the Jessica Lynch story, the Abu Grhaib stories are the rule, not the exception. There isn't a grain of truth in the Pentagon. Terrorism is called "collateral damage", torture is not anything the US does if the person lives, and if he dies it wasn't torture, it was heart failure or suicide.
And if one does find something, it's true only because one believes it, not because it happened as they explain it.