This United States Army manual, Army Techniques Publication ATP 4-71 Contracting Support Brigade June 2021, provides doctrinal guidance on how Army contracting support organizations fit into the ARFOR commanders’ mission construct and execution process, to include joint force commander (JFC) directed contracting missions. It serves as a guide on how the United States Army Materiel Command (USAMC), Army Contracting Command (ACC) and its subordinate contracting support brigades (CSB), contracting battalions (CBn) and contracting detachments (CONDET) are organized, deploy, and support deployed Army forces. It also provides detailed information regarding how ACC and its subordinate structure can lead the contracting support planning and coordination effort for the Army, and when directed, for the JFC. Finally, this publication provides additional information on other Army expeditionary contracting and contract support-related capabilities, such as the United States Army Corps of Engineers (USACE), the United States Army Intelligence and Security Command (INSCOM), the Logistic Civil Augmentation Program (LOGCAP), the United States Army Health Contracting Activity (USAHCA), and the Assistant Secretary of the Army for Acquisition, Logistics, and Technology (ASA [ALT]) forward support teams, along with the integration of these capabilities into the overall contracting support effort in a designated operational area. The principal audience for ATP 4-71 is Army operational commanders and staff members from the Army Service component command level down to brigade level units. Trainers and educators throughout the Army will also use this publication.