I am sure the gov't pays for all the medical costs for the soldiers, or at least I hope they do. Even with that I am sure they don't get a whole lot for books to read while in the hospital, maybe a treat here or there or just any small item that may not be medically necessary but would make them feel better while recouperating. Some of these soldiers may not have family near by or may not have access to funds in there condition and would like something. If 3 or 4 dollars is too much for you, and it appears that way, than don't give I'm sure they will still get better and again go out to the front lines for your freedom.
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