Costco currently (as of today's coupon pack) has a manufacturer's instant rebate of $3.25 for a 24-pack of Starbucks VIA instant coffee.* That's $12.74 instead of $15.99, which brings it down to what about a cup of coffee should cost.
If you're not a coffee drinker I can't explain to you how unusual it is for instant coffee to taste as good as VIA does--it's a good cup of coffee. (Many will tell you that it's better than a cup of Starbucks' drip. A matter of taste, of course.)
If you've never actually had your muddy boots on the ground someplace in close proximity to unfriendly natives, I can't explain to you what a cup of good coffee can do for your morale.
If you know someone who's deployed, or know someone who is putting together care packages for the Troops, I highly recommend this as an addition.
Another pro tip: Don't go shopping at Costco on the first day the new coupon pack is valid. Egad!
*"Limit three." I have no idea, as yet, if that's "three per membership, ever", or "three per visit." I have a co-worker who is deployed, and Mrs. Drang is a Soldiers Angel for a Marine, so I suspect we'll find out...