OK so not Mil but nonetheless of interest I'm sure to quite a few ... and not just you Air Traffickers
It never ceases to amaze me at what you can access on the interWeb ... and for free ... NO not that kind of stuff
Radar Box 24
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I undertook a little exploration this afternoon focused on Gatwick Traffic ... so not all traffic is shown but the Air Data available provides a seemingly reasonable representation of what's going on in almost Real Time. Tag a particular flight to get more detail and use the Pilot View to get a flight deck perspective (you need an account to do this and save your preferences).
A quick screen grab from my Mac ...
Best regards ...
Coff.