Headquarters and Headquarters Company
In United States Army units, a headquarters and headquarters company (HHC) is a company-sized military unit, found at the battalion level and higher. Considered one unit, a Headquarters and Headquarters Company is essentially two elements within one company. In identifying a specific headquarters unit, it is usually referred to by its abbreviation, HHC. While a regular line company is formed of three or four platoons, an HHC is made up of the Headquarters Company element's supporting personnel, and the supported higher Headquarters element of a battalion, brigade, division, or higher level unit. As the Headquarters element staff personnel do not fall inside the regular line companies of the battalion, brigade, division, etc., the HHC is the unit to which they are administratively assigned. The typical personnel strength of an average HHC is 80 to 110, but varies greatly based on the size of the supported Headquarters.