This card illustrates proper overseas airmail use from Okinawa, Japan to the states at the domestic airmail postal card rate. The card is sent from an overseas military APO. These are treated as domestic mail items, yet sometimes (as in this case) travel long distances.
As can be seen by the docketing on the reverse side of this card, it indeed appears to have traveled thousands of miles in only 2 days!
Place mouse on image to see the reverse side of the card.