Footage from 2003 shows the GBU-43/B bomb being tested at Eglin Air Force Base in Florida. Nicknamed the “mother of all bombs”, the GBU-43/B was used for the first time by the US military on Thursday to target a ‘tunnel complex’ used by the Islamic State’s Afghanistan affiliate. The US military later released video of the strike. It is the largest non-nuclear bomb the US has ever used in combat. Designed for destroying underground targets but not itself a deep-earth penetrator weapon, the GBU-43/B has the explosive yield of more than 11 tons of TNT.