Peanuts by Charles Schulz for February 21, 1966
Transcript:
The World War I Flying Ace leans against the doghouse and thinks, "Here's the World War I Flying Ace posing beside his Sopwith Camel."<BR><BR> The Flying Ace thinks, "I am taking off from an aerodrome in France somewhere just east of Pont-A-Mousson . . ."<BR><BR> The Flying Ace thinks, "My mission is to seek out the Red Baron and to bring him down! Contact!"<BR><BR> Snoopy waves and says, "So long, chaps! Wish me luck!" Charlie Brown says, "My dog has finally flipped!"<BR><BR>
Actually, you used to get the “ace” title after some successful missions: I guess that in those months Snoopy earned it.