The dropping of the GBU-43/B Massive Ordnance Air Blast (MOAB) in eastern Afghanistan, in the remote hills of Achin District in Nangarhar Province, unleashed a weapon of staggering power, one widely described as the largest non-nuclear explosive device in the entire American arsenal. „The after-effect, the shock wave, not only has physical effects but psychological effects,“ Col. Cedric Leighton (Ret.), told CNN.