Step: infantry, including mechanized infantry and foot infantry; Tan: that is, tank soldiers; Artillery: artillery, including all kinds of ground artillery, anti-tank artillery, battalion artillery, equipped with recoilless guns and medium and small caliber mortars; Air: air defense units, including anti-aircraft gun units and air defense missile units; Reconnaissance, that is, scouts, including armed scouts who carry out infiltration reconnaissance in front of or behind the enemy, and technical scouts who use electronic and optical reconnaissance instruments such as radar to conduct reconnaissance; Engineer: engineering, including ground blasting (mainly responsible for mine laying and various blasting operations), roads and bridges (mainly responsible for opening emergency military roads and erecting various bridges across the street), fortifications (mainly responsible for building various technical weapons bunkers and headquarters); Communication: that is, signal soldiers, including wired, wireless, relay, carrier, network and other majors; Chemical warfare: chemical warfare, including fire breathing, poison detection and purification.
Of these eight arms, the first four are combat arms and the last four are combat support arms.