at the pentagon tonight. >> good evening, when the u.s. air force tested this bomb in 2003, the club that resulted reached 10,000 feet in the air. this weapon was designed for the iraq war but never used on the battlefield until the day. >> we have the greatest military in the world, and they've done their job as usual. >> at 7:32:00 a.m., they drop the largest nonnuclear weapon in the u.s. military has ever used in combat. the gbu-43, a 21,000-pound bomb known as the mother of all bombs are massive ordnance air blast. described a complex of isis tunnels. >> we targeted a system of tunnels and caves that mattis fighters used to move around freely. the united states takes the fight against isis very seriously, and we must deny them operational space, which we did. >> singh the top general in