Goto VA website and they should have a link to inquire about the military issued items. You will have to send in a form with his name, dob, SSN, and time in service. Being that he is still alive you may get limited information but it's worth a try. I am in the process of doing the same thing except I am including both my grandfathers as well as my dad. All three have passed away and I wanted to do something to remember each of their time in service. Good Luck.
I will try to find the exact information for you and post it here when I have more time.