Inside a battalion HHC, the headquarters staff will usually include the following key officers and primary staff officers: Depending on the unit, extra support officers will round out the staff, including a medical officer, Judge Advocate General's Corps (legal) officer, and a battalion chaplain (often collectively referred to as the "special staff"), as well as essential non-commissioned officers and enlisted support personnel in the occupational specialities of the staff sections (S1 through S4 and the S6), and a battalion command sergeant major, who is principal advisor to the battalion commander on matters regarding enlisted personnel. Additionally, the HHC will contain further personnel assigned to support and sustain the mission of the battalion headquarters, including maintenance an