A Headquarters and Service Company is a company sized military unit, found at the battalion level and higher in the United States Marine Corps. In identifying a specific headquarters unit, it is usually referred to by its abbreviation as H&S. While a line company is formed of three or four platoons, H&S is made up of the headquarters staff and headquarters support personnel of a battalion, MEU, regiment, MEB, division, or MEF. As these personnel do not fall inside one of the line companies of the battalion, regiment, or division, the H&S Unit is the unit to which they are administratively assigned. The typical personnel strength of an average H&S Company for a Marine infantry battalion is 270 personnel.