Iran's Revolutionary Guard runs drill on disputed islands as US military presence in region grows

The drill comes as thousands of Marines and sailors on both the amphibious assault ship USS Bataan and the USS Carter Hall, a landing ship, are on their way to the Persian Gulf. Already, the U.S. has sent A-10 Thunderbolt II warplanes, F-16 and F-35 fighters, as well as the destroyer USS Thomas Hudner, to the region.