Army radio follow a very simple procedure.6-Unit commander7-highest ranking sergeant (NCO)5-Executive officer”Black” is always the callsign for the headquarters element. So the commander would be called “Black 6,” although the callsign is normally a lot cooler.At the company level, the company name is normally used before the number. So the Bravo company commander will be called “Bravo 6.”At the platoon level, the platoon number is used after the company name, but before the name. position name So the platoon leader of 2nd platoon, Bravo company would be called “Bravo 2-6″ and the platoon sergeant Bravo 2-7.”