My mistake, thank you for researching this, Jackie.
Correction: Cards should be sent through the Red Cross Holiday Mail for Heros program (Holiday Mail for Heroes | American Red Cross | Military Support
). There is an inspiring video on that page.
Guidelines and address copied from that page:
Please observe the following guidelines to ensure a quick reviewing process:
Ensure that all cards are signed.
Use generic salutations such as “Dear Service Member.” Cards addressed to specific individuals can not be delivered through this program.
Only cards are being accepted. Do not send or include letters.
Do not include email or home addresses on the cards: the program is not meant to foster pen pal relationships.
Do not include inserts of any kind, including photos: these items will be removed during the reviewing process.
Please refrain from choosing cards with glitter or using loose glitter as it can aggravate health issues of ill and injured warriors.
If you are mailing a large quantity of cards, please bundle them and place them in large mailing envelopes or flat rate postal shipping boxes. Each card does not need its own envelope, as envelopes will be removed from all cards before distribution.
All holiday greetings should be addressed and sent to:
Holiday Mail for Heroes
P.O. Box 5456
Capitol Heights, MD 20791-5456
The deadline for having cards to the P.O. Box is Friday, December 7th.
Holiday cards received after this date cannot be guaranteed delivery.