More than 200 military engineers packed grandstands erected on a hill in the heart of this desert combat training center Wednesday to witness the destructive power of the enemy’s primary weapon in Iraq: crude bombs built with cellphones and old artillery rounds. The carefully choreographed demolitions of a 5-ton truck, a sedan and a manikin “suicide bomber” were intended to spur new approaches for combating the improvised explosive devices, or IEDs, as they are known in military parlance. Full Story