The back of the card is not so much a message as a notation.
On the left it says:
Souvenir of Gemma and Wilfred Lavoie from Quantico, Virginia 10 Dec 1952.
On the right it says:
Charles Lindbergh crossed the Atlantic for the first time in 1927.
Lindbergh was so badly misspelled that I had trouble making out what it was at first, and it has nothing to do with this postcard as far as I can tell. Maybe it's a cold war spy message.