There has been a series of serious crimes -- murders, robberies -- committed recently by returning Iraq/Afghanistan vets in several states. I believe they were investigated and prosecuted by civilian LE. Google it and see what comes up.
Good suggestion and reminder. I've rethought this part as well; instead of a straight-up robbery, it's become a fairly standard check-kiting scheme, committed in the early 90s. The catch will be that while he did the kiting off-post, he was using the personal information of sailors and Marines who were heading out to sea, and he obtained that information through his military position, so that crime was committed on-post. I've got an email out to NCIS to see if they are willing to answer any questions about how this might be handled.