We can assume that if the DoD thought this guy was a serious threat, then they would have shipped him off to Gitmo. That means that we can assume they didn't have more than unreliable and inadmissible hearsay evidence against him, and in addition maybe just didn't like his reporting or something. In any case, we can assume this was another shameful episode of the US preaching rule of law to others while ignoring the concept as applied to us.