Mini D and Yeager obviously have'nt watched "Off to War". In it National Guard officers were shocked to find loose stockpiles of bombs, mortars, rockets, and artillery just laying open on the ground with nothing more than a broken barbed wire fence securing them. Unsecured bunkers were empty that should have been full. Oddly enough some of those missing mortars were finding their way home every night, right into the troops sleeping quarters. So yes, insurgents did just walk off with them and use them against our troops later.
Remember the looting of Baghdad? Do you think they just grabbed the tractor tires and left everything else alone?