3-67. Sustainment plays a key role in enabling the simultaneous offensive, defensive, and stability or defense support of civil authorities tasks that occur as part of unified land operations. For example, general engineering support provides construction support to protect key assets such as personnel, infrastructure, and bases. Horizontal and vertical construction enables assured mobility of transportation networks and survivability operations to alter or improve cover and concealment to ensure freedom of action, extend operational reach, and endurance of the force. Legal personnel supporting rule of law activities may find themselves working closely with HN judicial, law enforcement, and corrections systems personnel.