There are many stores that offer 10%, and shoe stores like Champs, finish line, foot locker ... They offer you 20%. Just ask at the stores when you go to pay!
He's asking if there's any other stores he can shop with a military ID .... No, you can only with the air shops are on the bases.
My Spanish is weak, but you should call the customer service desk with specific question on who can shop and buy.
If you're a military dependant, you're allowed to buy on base with a legal I.D. If They're On Sale , Yes .
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