I shop with my mom at a Navy PX and they are very dilligent about checking coupons. Even if it is one day expired they won't accept them. I think you have been misinformed.

While I don't think the AAFES or Navy Exchanges take expired coupons, the DECA Military Commissaries overseas certainly do.


http://www.commissaries.com/documents/contact_deca/faqs/coupon_use.htm

Do commissaries accept coupons?

Yes. Commissaries accept most types of coupons as part of purchase transactions in accordance with the terms and conditions stated on a coupon.

Commissaries CANNOT accept "in-house" coupons issued by commercial grocery stores or supermarkets.

Patrons who wish to use coupons as part of a purchase transaction must buy the item(s) indicated on a coupon, and-except in foreign overseas areas-must use a coupon prior to or on the expiration date stated on a coupon.

Commissaries located in foreign overseas areas accept coupons up to six months after the expiration date stated on a coupon.