 Complete the following phrase:  The 2d Antiaircraft Artillery Battalion 2d AAA Bn was a United States Marine Corps antiaircraft unit that served during World War II. Formed in 1940 as the 2d Defense Battalion, its original mission was to provide air and coastal defense for advanced naval bases. During the war the battalion defended Hawaii, Tutuila in American Samoa and Guam and took part in combat operations at 