There’s a cute cartoon in the New Yorker magazine .
It shows a group of soldiers under fire in the trenches of World War I. One of them reaches out to his buddies and says :
“If I don’t make it out of here alive, please send my sweetheart this picture of my crotch”.
Almost completely unrelated to the OP: but a cartoon which I once saw – which greatly amused me – showed a small bunch of American War of Independence soldiers: a sergeant, a higher-ranking officer, and several privates. The sergeant was saying to the officer, “I’m a bit worried about Doodle, sir. He keeps sticking a feather in his hat and calling it macaroni.”
They should use Paris Hilton on posters warning troops of VD.