There's stupid and then there's "stupid" putting my tinfoil hat on here: maybe they were allowed to steal the data. I mean really? Oh WOOOPS we stored 613 GB of classified data on an unsecured network in the EXACT place hackers would look... aww that sucks, welp we'll try to do better next time.
I call BS, this level of incompetence smells more like treason disguised as stupidity.