<P> A sergeant first class is typically assigned as a platoon sergeant at the company level or battalion operations non-commissioned officer in charge at the battalion level , but may also hold other positions depending on the type of unit . In a combat arms role , a sergeant first class is typically in charge of from 18 soldiers and four tanks in an armor platoon to 40 soldiers in a rifle platoon . A sergeant first class ' primary responsibilities are tactical logistics , tactical casualty evacuations , and serving as the senior tactical adviser to the platoon leader . Sergeant first class replaced the rank of technical sergeant in 1948 . ( However , the U.S. Air Force , which separated from the Army in 1947 , retained the rank of technical sergeant and the U.S. Marine Corps had the rank of technical sergeant until 1959 ) . </P>
what does a sfc do in the army
tactical logistics tactical casualty evacuations serving as the senior tactical adviser to the platoon leader