Doonesbury by Garry Trudeau for November 29, 1972
Phred: Dear running dog: When are you coming over here again? With the threat of impending peace, I hope it's this year! Pretty soon there will be tourists and resorts and hotels. I so want you to see the real Vietnam before it's spoiled! Hee, hee! Hee! Hee! My, I'm amusing.