I work around the outside of the DoD world myself and I wish you the best of luck. The office of no in the DoD is extra strict and their (government) actual security is awful. Without getting into the details some of the stuff I have seen employees do is shocking. Another hoop you have to jump through is that it is such a pain to get hired by the DoD or IC and a lot of the better security people have a culture which clashes with IA and OPM to say the least so even if someone wants to get hired by them there is a good chance they will get rejected off of a culture fit or they smoked pot once in college half a decade ago.