Thank you very much for your service!! May you have a safe return to USA. Welcome here.

There is a fair to middlin' chance that it is a W&S Screw Grip action gun - the Screw Grip was very popular and made in many grades of both side lock and box lock. While not used for "best" quality grade guns, the top SG models were very good indeed.

I'll see if I can scroung up some photos and post them for your consideration.

Stay safe.