officer, which involved taking a test – that way you didn't have to go through Officer Candidate School." En route to Washington, D.C., he stopped at the Holabird Ordnance Depot in Baltimore, where a mimeographed publication titled Army Motors was put together. "Together with the people there ... I helped develop its format. I began doing cartoons – and we began fashioning a magazine that had the ability to talk to the G.I.s in their language. So I began to use comics as a teaching tool, and when I got to Washington, they assigned me to the business of teaching – or selling – preventive maintenance." Eisner then created the educational comic strip and titular character Joe Dope for Army Motors, and spent four years working in The Pentagon editing the ordnance magazine Firepower and doing "all the general illustrations – that is, cartoons" for Army Motors. He continued to work on that and its 1950 successor magazine, PS, The Preventive Maintenance Monthly, until 1971. Eisner also illustrated an official Army pamphlet in 1968 and 1969 called The M16A1 Rifle specifically for troops in Vietnam to help minimize the M16 rifle's notorious early reliability problems with proper maintenance. Eisner's style helped to popularize these officially-distributed works in order to better educate soldiers on equipment maintenance. While Eisner's later graphic novels were entirely his own work, he had a studio working under his supervision on The Spirit. In particular, letterer Abe Kanegson came up with the distinctive lettering style which Eisner himself would later imitate in his book-length works, and Kanegson would often rewrite Eisner's dialogue. Eisner's most trusted assistant on The Spirit, however, was Jules Feiffer, later a renowned cartoonist, playwright and screenwriter in his own right. Eisner later said of their memories of their working methods on the feature, "You should hear me and Jules Feiffer going at it in a room. 'No, you designed the splash page for this one, then you wrote the ending – I came up with the idea for the story, and you did it up to this point, then I did the next page and this sequence here and...' And I'll be swearing up and down that 'he' wrote the ending on that one. We never agree." So trusted were Eisner's assistants that Eisner allowed them to "ghost" The Spirit from the time that he was drafted into the U.S. Army in 1942