Six B-2 stealth bombers from Whiteman Air Force Base in Missouri appear to be en route to a U.S. Air Force base in Guam, according to flight tracking data and voice communications with air traffic control. The bombers apparently refueled after launching from Missouri, suggesting they launched without full fuel tanks due to a heavy onboard payload, which could be bunker-buster bombs. The B-2 can carry two 15-ton bunker-buster bombs—which only the U.S. possesses. Experts say the bombs could be critical to targeting Iran’s most heavily fortified nuclear site: Fordow.