Word War II patriotic "Christmas Greetings to My Sweetheart in the Service" card featuring military aircraft, the Statue of Liberty, and an American flag. The interior includes a color picture of the LIberty Bell with red, white, and blue ribbon.
Christmas cards were designed for people serving in all branches of the service. This one shows a cute sailor boy (although I'm not sure why his head would be sticking out of a big gun barrel). To see more: www.elinorflorence.com/blog/christmas-cards.