Got this today from a friend - glad I bought extra cards this year and my 7yo and 4yo are going to make homemade ones, too....

I'm sure many of you are currently writing cards to friends and
family. If you can, please send an extra one (or 10, or 20) to our
American military heroes who are recuperating from wounds this
Christmas Season. Please enclose a short note thanking them for their
service and personal sacrifice. They are the protectors of our
freedom, we must let them know. Your small act of kindness will be
greatly appreciated. Here's the address...

A Recovering American Soldier
c/o Walter Reed Army Medical Center
6900 Georgia Avenue, NW Washington, DC 20307-5001