As with all of the other "commemoratives", in order for this to have any value beyond the parent firearm, it must be unfired, in the original box, with all the original paperwork (manual and hanging tags). And then, you need to find someone who's interested in collecting commemoratives - most of these things turn out to be an albatross around your neck.
If it doesn't meet the above requirements, it's a Springfield GI 45..... about $500 new.
The strangest part of this whole affair is that, by the Gulf War, the Army had switched to the 9x19 Beretta 92, and was no longer using the .45ACP 1911..... shouldn't a "Gulf War Commemorative" be a Beretta 92? Go figure.