Doonesbury by Garry Trudeau for May 19, 1973
B.D.: Hey, Skipper, I got a letter from a Vietnamese friend of mine today. I'd like to show it to you... Man: I'd like to see it. I've got a friend over there, too. Only thing is, he was with the other side. Actually, he was the monkey who captured me. He's a little weird - he got lost bringing me in. His name is... but, no. It's all too ridiculous. You'd never believe me! B.D.: Try me!