This publication establishes the Army's doctrine in support of the Every Soldier is a Sensor (ES2) initiative. The need for Soldiers to be aware that basic observations are an important part of operations has led to the development of this manual. This manual expands on the information contained in ST 2-91.6 and provides a foundation for developing tactical questioning and reporting and supersedes all other tactical questioning handbooks produced by the United States Army Intelligence Center (USAIC), specifically the Tactical Questioning Soldier's Handbook and ST 2-91.6.