; (II) assisting or escorting a vessel of national security significance, a high interest vessel, a high capacity passenger vessel, or a high value unit, as those terms are defined by the Secretary; (III) section 91(a) of this title; (IV) assistance in protecting the President or the Vice President (or other officer next in order of succession to the Office of the President) pursuant to the Presidential Protection Assistance Act of 1976 ( 18 U.S.C. 3056 note); (V) protection of a National Special Security Event and Special Event Assessment Rating events; (VI) air defense of the United States, including air sovereignty, ground-based air defense, and the National Capital Region integrated air defense system; or (VII) a search and rescue operation