Go to the Apple site and click on Support.

There you will find a field to enter your serial number.

Although this will not check the warranty status of the machine, it will give you a chance to see if the TriCare (a military health Plan) serial number is for the machine or for your contract with whomever issued the sticker.

This "may" be something to do with Triad, Computer Solutions.

let us know how you get on