The US military has tested the biggest “bunker-buster” bomb in its arsenal, a 15-ton bomb designed to penetrate targets buried deep underground, a report says. The Wall Street Journal reported on Friday that the 30,000-pound (15 tons or 13,608 kilograms) device, known as the Massive Ordnance Penetrator (MOP), was tested in mid-January. A B-2 Spirit Stealth Bomber, which took off from Whiteman...