Don't quite follow you mate? Do you mean - since when does the British Army use stand alone ECUs?
The Military Spec connections are just completely waterproof e.t.c - the round connection on this Motec M880 is Mil Spec....
http://www.who-sells-it.com/ctp/350/16/full/
The square connectors on these ECUs are the normal - non military spec - connections:
http://www.who-sells-it.com/ctp/350/31/full/