Company First Sergeant (1SG) The company first sergeant is responsible to the company commander for administrative matters. The company first sergeant is responsible for company formations, submits absentee reports to the battalion Command Sergeant Major, checks all merits and demerits with the company commander before submitting them to the S-1, and keeps the company commander informed on all matters pertaining to health and welfare of the unit. The first sergeant assumes command of the company in the absence of all officers.