The convoy carried the 4th Marine Defense Battalion , the VMF-221 fighter squadron equipped with Brewster F2A-3 Buffalo fighters , along with 9,000 5-inch rounds , 12,000 3 in ( 76 mm ) rounds , and 3,000,000 .50 in ( 12.7 mm ) rounds , as well as a large amount of ammunition for mortars and other battalion small arms .
The convoy carried the 4th Marine Defense Battalion and the VMF-221 fighter squadron .