Training Circular TC 3-04.6 (FM 3-04.120) Air Traffic Services Operations December 2017 Training Circular (TC) 3-04.6 serves as a doctrinal guide primarily intended for the theater airfield operations group (TAOG), airfield operations battalion (AOB), and air traffic services (ATS) company commanders, subordinate leaders, and assigned personnel. This manual describes structure, mission, employment and sustainment of ATS units supporting major combat, stability and civil support operations. It establishes responsibilities and duties of key personnel and discusses planning considerations required for training, operations, and combat. TC 3-04.6 is authoritative and prescriptive but is not inflexible. Situations in combat are resolved by the intelligent interpretation and application of this doctrine.