Thanks to Annette for sending in this suggestion:

When you are doing Christmas cards this year, take one card and send it to  this address.  If we pass this on and everyone sends one  card, think of how many cards these wonderful special people who have sacrificed so much would get.

Here is the address:

A Recovering American Soldier

c/o Walter Reed Army Medical   Center

6900 Georgia Avenue,NW
Washington , D.C. 20307-5001