PS Magazine
PS: The Preventive Maintenance Monthly, more commonly referred to as PS Magazine, was a series of United States Army pocket-sized bulletins published between June 1951 and November 2019 as a monthly magazine with comic book-style art to illustrate proper preventive maintenance methods, as well as proper supply procedures and related safety. The magazine's title is derived from it being a "postscript" to technical manuals and other published maintenance guidance. In March 1987, PS was officially designated as a technical bulletin.
Source: Wikipedia
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