The cover gag is reworked from the Beetle Bailey daily newspaper strip of August 17, 1967, reprinted in the 1969 paperback collection "Fall Out Laughing, Beetle Bailey" from Tempo Books.
To make the contrast all the more humorously stark, Killer remains well-behaved and good-mannered throughout the story (rather than as his typically girl-crazy self) all the more flummoxing Julie's suspicious dad.
Feature is titled "Sarge and Beetle".