Ladies - there's a couple of other options if you'd like to get involved and help soldiers, but don't know anyone in specific. Call your national guard offices (locally or for your state) they will probably be able to give you information for soldiers who would love to get mail while serving overseas.
A second option is a website and organization called Any Soldier. On their website
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you can find information on soldiers who are looking for stuff for themselves as well as their unit. On the website, you will be able to get their contact information, read emails, see pictures, etc for different military units.
This is a ligit group...I know someone directly involved with publicity for this organization. While we lived in Georgia, (about 45 min from Ft. Benning) our Sunday school class sent at least a thousand dollars worth of supplies (socks, t-shirts, toiletries, stationary, cards, batteries, music, phone cards, magazines, basic first aid kits, etc) to soldiers. These soldiers are protecting our country, but cannot get basic needs without spending what little money they have.
While you may not know anyone directly, you just have to get creative. Hope this information helps!