Headquarters unit

A headquarters unit is a specialised military unit formed around the headquarters of a commanding officer and the requirements of that position. As such, a headquarters unit is always a component of a larger unit.

Examples include:
 * headquarters battalion (controlling a regiment, brigade or larger unit);
 * headquarters company (military unit) (controlling a battalion);
 * headquarters platoon (controlling a company)

Specific examples include:
 * Headquarters and Headquarters Company (US Army)
 * Headquarters and Service Company (US Marine Corps)