This multi-Service publication, Army Techniques Publication ATP 4-10 Operation Contract Support February 2016, focuses on tactical level Service component requiring activity functions, and includes limited information on Army, Air Force, Marine Corps, and Navy component level headquarters' unique operational contract support (OCS) staff organization and capabilities. It also contains an overview of Service unique theater support, external support and systems support contracting capabilities. The principle audiences of this publication are tactical level Army, Air Force, and Marine Corps operational force unit commanders and staffs along with their supporting contracting organizations. This publication also applies to Naval forces operating ashore when these forces are being supported by Army, Air Force, or Marine Corps units. Service training and education staffs will also use this manual to support OCS-related training and leader education. This multi-Service publication contains five chapters: Chapter 1 introduces OCS and other OCS-related terms, introduces the OCS process and team, discusses key OCS imperatives to minimize risk of contract fraud and unauthorized commitments, and closes with a brief discussion on ethics. Chapter 2 discusses joint planning guidance and the integration of OCS requirements into tactical level planning. It also covers considerations for conducting relief in place and base drawdown and closure. Chapter 3 describes the requirements development process with a focus on requiring activity and supported unit functions. It also discusses the critical parts of a contract support request package and the contract support request package approval process. Chapter 4 covers requiring activity and supported unit responsibilities in contract performance oversight, how contract support is typically assessed, and contains sections on unauthorized commitments, ratifications, and contract closeout actions. Chapter 5 discusses contractor management planning, linking contractor management requirements to the requirements development and contract performance oversight processes, contractor management risks and challenges, contractor personnel legal status information, deployment and redeployment planning and preparation requirements, contractor management in theater, and closes with a section on ensuring fair labor processes. ATP 4-10 (ATTP 4-10) MCRP 4-11H NTTP 4-09.1 AFMAN 10-409-O