This MTTP, Army Techniques Publication ATP 4-10 Multi-Service Tactics, Techniques, and Procedures for Operational Contract Support Change 1 March 2023, provides operational contract support (OCS) guidance for Army, Air Force, Navy, and Marine Corps commanders, their non-acquisition officer staffs, and their servicing contracting organizations. It serves as the primary reference document for planning and execution of OCS, associated functions and tasks at the tactical level. It supersedes ATP 4-10 dated 18 February 2016 and incorporates the latest guidance found in JP 4-10, dated 4 Mar 2019 and other associated regulatory guidance.