What is the duty of a Philippine army reservist? – The mission of the Citizen Armed Force, alternately referred to as the Reserve Force, is to provide the base for the expansion of the Armed Forces of the Philippines in the event of war, invasion or rebellion; to assist in relief and rescue during disaster or calamities; to assist in socioeconomic development; and to assist in the operation and maintenance of essential government or private utilities in furtherance of overall mission.