I wonder if this sends a card to a specific soldier? I have read on CNN and Fox News that letters addressed to "any wounded soldier" are being returned, due to a lack of personnel to screen them (for anthrax, and to make sure they are not hateful and anti-soldier).

Oops, I posted too soon. Apparently they have this covered:

Q: How do these cards reach the troops?
A: We use our partner Give2TheTroops® to send the postcards in care packages to the troops. While the military and postal service does not permit packages to “any soldier,” Give2TheTroops has a list of specific military personnel to take care packages to the troops on our behalf. Please visit their site at www.Give2TheTroops.org for information on how you can contribute.