All I have to say is that back in I worked for the Navy PEO IWS and every year they send out requests for individuals to submit concepts (i.e. needs) for warfighter capabilities for potential SBIR grants. I think it was about 2011 or so when the idea to work on changing out the common display system (CDS) with a COTS head up display and game controller (vuzix at the time, occulus hadn't really emerged yet) was proposed.

The idea was laughed off the screen.