Training circular (TC) 3-04.81 provides administrative and operational standards for United States (U.S.) Army air traffic control (ATC) facilities and units. This publication is intended for use by all Active Army, Army National Guard (ARNG), United States Army Reserve (USAR), Department of the Army civilians (DACs), and contract personnel who perform ATC duties for the U.S. Army. TC 3-04.81 consists of two parts-part one (chapters one through four) applies to installation (fixed) ATC facilities only and part two (chapters five through eight) applies to tactical ATC facilities. The appendices are common to both installation and tactical ATC facilities.