Doonesbury by Garry Trudeau for May 27, 1972
Man: So long, kid, hope they send you to Germany like you want. B.D.: Me, too. Thanks for bringing me down to the airport, George. Man: Raid! Let's get out of here! B.D.: Hey, George, don't worry! It's just Phred saying goodby! Phred: A twenty-one mortar salute.