That’s because up until now, in the quiet arms race between concrete and bombs, the concrete has been winning. The Air Force asked for ideas on January 18, and work commenced immediately at the Air Force Research Laboratory Munitions Directorate at Eglin Air Force Base, Florida. The first prototypes were delivered to the Air Force less than a month later. USAF // Getty Images The Massive Ordinance Air Blast (MOAB) weapon, March 11, 2003 at Eglin Air Force Base, Florida. The U.S. Air Force will understandably not discuss its current bunker-busting capabilities or how they stack up against potential targets in Iran, China, or elsewhere.