After a few calls with the HR staff it was one big panel interview with a large group over the phone. They got back to me the next day. In the Defense Industry one interview seems to be standard.

Good interview, connected with the team, answered all the questions asked in the hour long interview. It has been over a month since interview and I have heard nothing, not even a "we are still interviewing". Sent an email the day after thanking them and another 2 weeks after to the hr rep and got no response good or bad.