Current and future threats, both internal and external, would employ conventional, irregular, hybrid, and unconventional means of conducting warfare across all operational environments. Such threats may come from state (foreign armed forces) or non-state (local dissidents, or local and foreign terrorists) actors that aim to challenge or disrupt our Country’s National Security.      The strategic geographic location of the Philippines provides advantages on natural resources, geo-political, and economic aspects. It is an important hub for both air and maritime traffic within the South-east Asia Region that has implication on tourism, trade, and strategic military deployment. This makes the Philippines vulnerable to external threats such as Chinese aggression, transnational crime, Islamic radicalization, cyber-attacks and foreign intrusion among others.      Internal threats such as the Zamboanga and Marawi Crises are examples of the evolving threats in the country. Today, secessionist and terrorist groups target urban areas as it amplifies the destructive impact of their campaign due to the presence of critical infrastructures, high civilian population, and structural defensive advantages of these areas. These two crises led to the realization that our soldiers are unfamiliar in urban warfare, there is a lack of readily deployable units, and there is a need to improve sustainment for prolonged operations.      In 2016, the Territorial Defense Division (TDD) was approved as the contingency force of the Army to address such threats. The TDD will be composed of Brigade Combat Teams (BCT) as the basic deployable unit. This manual will serve as the guiding principle for the operationalization of BCTs.      Stakeholders of this Brigade Combat Team (BCT) Operations