I think that these have been identified in the past as Model 10 or Victory Model revolvers (in some pictures they have lanyard loops), not Model 15s. AFAIK the fake stag grips and plating was done by the Air Force but ordnanceguy or one of the other experts may come along and correct me.
Thanks for posting the picture. Very cool. If you aren't familiar with it there is a great website that has lots of pictures and film clips of the Elite Guard:
SAC Elite Guard
Regards,
Kevin Williams