Non-commissioned officers may be said to "have charge of" certain smaller military units. They cannot, however, hold "command" as they lack the requisite authority granted by the head of state to do so. Those wielding "command" of individual vehicles (and their crews) are called vehicle commanders. This distinction in title also applies to officers who are aircraft commanders ("pilot in command"), as well as officers and enlisted soldiers who are tank and armored vehicle commanders. While these officers and NCOs have tactical and operational command (including full authority, responsibility, and accountability – especially in the case of aircraft commanders) of the soldiers and equipment in their charge, they are not accorded the legal authority of a "commanding officer" under the UCMJ or military regulations.