Another find at the antiques mall was The Best from YANK the Army Weekly, selected by the editors of Yank. Cleveland & New York: The World Publishing Company, 1945 (second printing, though there's also the note, "The material and format of this edition are the same as of that originally published by E.P. Dutton & Co., Inc."). Among the contents that caught my eye were a number of cartoons by creators whose careers continued in cartooning.
 
For example, there's Sgt. Ralph Stein, whose work appeared on several pages -- and a Google search I just made turned up the information that, in fact, the artist (who died in November 1994) had made his career in the field after being the staff cartoon editor for Yank, as well as providing text and photos. He went on to draw Popeye for five years and illustrated Here's How for King Features.
 
Other cartoonists included Sgt. George Baker (1915-1975, the creator of Sad Sack, which is what's reprinted here); Sgt. Dave Breger (1908-1970, who may have invented the term "GI Joe" and went on to create the Mister Breger newspaper panel), and Sgt. Al Jaffee (1921-, creator of the Mad "Fold-In").
 
And here's a non-Family Circus cartoon by Bil Keane (1922-). Note that he signed it "Bil Keane," but both the attribution line and the table of contents add an "l" to his first name. (By the way, you'll find more of such early work at the Family Circus website. Also by the way, you'll find there a note on the spelling of his name: "In the late '30s, Keane was working with a group of friends putting out a satire magazine, The Saturday Evening Toast, when he decided to drop the second L in 'Bil.' 'I really did it just to be different,' he says. 'I thought it was a little more distinguished and started signing my cartoons that way, and it stuck." Which is probably why Yank didn't alter it, no matter how he signed his work.)