The problem with this is, you have to think forward to the time when (God willing) this war will be over and we won't have as many college age combat veterans as we do now. Then the fraternity either dies out for lack of a member pool or it has to change its purpose. I believe that one of the NIC groups was originally formed for this purpose after WWII, but is now just a general-interest fraternity.
There is
Pershing Rifles but I'm not sure if they have changed their programming at all to accomodate the increased numbers of veterans at colleges. You could try giving them a call though.