This training circular (TC) is one of a series that describes the Hybrid Threat Force Structure (HTFS) for training U.S. Army commanders, staffs, and units. See the References section for a list of other publications in this series. (Other publications in the former Field Manual [FM] 7-100 series will be converted to TCs as well.) Together, these TCs outline a Hybrid Threat than can cover the entire spectrum of military and irregular capabilities against which the Army must train to ensure success in any future conflict.