Spin-off of the Beetle Bailey newspaper strip.
Per the book "The Charlton Companion" by Jon B. Cooke (TwoMorrows Publishing, 2022), page 186, all issues in the series were written and drawn by Greg Walker:
"Mort [Walker]'s oldest son, Greg Walker, was entering his mid-20s, and had already done some freelance writing for Gold Key (Bullwinkle, Dudley Do-Right) and Charlton (Underdog art, Barney and Betty Rubble scripts) when he got the assignment to launch Sarge Snorkel, the singular Beetle Bailey comic book spin-off (well, to be technical, aside from Hi and Lois), which he wrote and drew for all 17 issues. 'Sometimes I would work more closely with my dad on the covers,' he told the author."