There is a wonderful stamp company called CC Designs Rubber Stamps who has recently released a new stamp set that is perfect for using on Operation Write Home cards. A bunch of Thinking of You stamps and also a bunch of Miss You stamps. In all shapes and sizes.
They can be found HERE. They are having a special on Veterans Day, November 11th. Go check them out today. And thank a veteran or 2. :) Here are some cards samples: