Walker created the "Beetle Bailey" comic strip in 1950. Bailey was originally cast as a slacker college student, but with the outbreak of the Korean War, he enlisted in the military - and never left. Walker said he drew decades of material from his own army service during World War II - "four years of free research," he called it.
The strip, originally published in 12 newspapers, proved immensely popular with its mockery of mindless bureaucracy and pompous authority figures. It was ultimately carried by 1,800 papers in 50 countries, making Walker one of the most read cartoonists in history.
Walker was also co-creator of the popular "Hi and Lois" strip, and he founded the International Museum of Cartoon Art, now part of a collection at Ohio State University. But he was best known for creating Bailey, the perennially hapless private - whose motto was to never stand when he could sit - and his supporting cast, from Bailey's perpetually frustrated Sarge up through martini-loving General Amos T. Halftrack.