Thursday, April 13, 2017, at 7:32 p.m. ET, the US dropped a GBU-43/B Massive Ordnance Air Blast Bomb, more commonly referred to as the “mother of all bombs. The target was an ISIS cave and tunnel complex in Nangarhar Province, Afghanistan. The blast is said to have slain more than 90 ISIS fighters. Where the MOAB sat in secret prior to its drop is a lesser known story.