Per AR 700-138 Army Logistics Readiness and Sustainability (23 April 2018), PS Magazine is:

 

Intended to enhance materiel readiness by emphasizing preventive maintenance and promoting proper maintenance and supply procedures. Review of PS Magazine will be a regular part of unit readiness initiatives. A reader service is available to answer maintenance and supply questions.
 

PS Magazine is a subordinate activity of the U.S. Army Sustainment Command (ASC), Rock Island Arsenal, IL.
While ASC is headquartered at Rock Island, PS Magazine is located at the ASC Detachment, Redstone Arsenal, AL.
To learn more about ASC, click on the logo below.