An Army ranger was deployed to Afghanistan. While he was there he
received a letter from his girlfriend. In the letter she explained that she
had been dating two guys while he had been gone, she wanted to break
up and she wants pictures of herself back.

So the Ranger does what any squared away Ranger would do.

He went around to his buddies and collected all the unwanted photos
of women he could find. He then mailed about 25 pictures to his
girlfriend with the following note: "I'm sorry I can't remember which
one you are, but please take the one that belongs to you and send
the rest back. Thank you".