Normally, the military discounts programs on some occasions of the year. In order to know whether it is offered or not is depended on Kosterina's policy sales, you can visit the store now for your reference.

Of course not, most coupons may be used only by you when you received them directly from Kosterina. As the Kosterina coupon includes your User ID, it cannot be resold or transferred in any way.

Usually, Coupon Stacking is not allowed at Kosterina. However, the store will surely give out notice if available.

The sitewide discount from Kosterina is applied on certain purchases. For Year-End Deals, the store may have its own requirement to offer you a sitewide discount.