Preventive Maintenance Monthly was the Army's comic book to teach maintenance tips to soldiers. The main characters were MSgt Half Mast, Connie Rodd (the blond), and later a black babe named Bonnie. AFIK, it's sill being distributed to Army units. There were many more characters in June 1951, Private Joe Dope, Private Fosgnoff, MSG Bull Dozer, Percy the Skunk, SFC Windy Windsock, SFC Macon Sparks, SFC Pablo Hablo, Half-Mast, and Connie Rodd. Two remain as of 2010: Half-Mast, who was promoted to Master Sergeant, and Connie Rodd, both of whom have appeared in every issue.
Later characters that as of 2010 still appear are: Bonnie, an African-American civilian who appeared in 1970 to work with Connie; SFC Benjamin "Rotor" Blade, an aviation specialist; and the Online Warrior, a Logistics Management avatar.
I always thought the PM Monthly was a very good tool for the guys to read and pickup maintenance tips. Will Eisner did the panels for PM Monthly. Eisner was a renowned artist for DC Comics and branched out to other fields. Sadly, Eisner died on January 3, 2005, from complications of quadruple bypass surgery. Here:
http://en.wikipedia.org/wiki/Will_Eisner