TIKRIT, Iraq – Here's the conundrum: You've got six really big missiles, and the bosses want to make sure they don't get used. You don't know what's inside, and you don't want to find out that it's a chemical or biological weapon. That rules out tried and true methods of firing a few rounds from a .50-caliber machine gun or an automatic grenade launcher, or taking care of business with a chunk of plastic explosive. The solution: a variation on an old prank played on unsuspecting cattle. Instead of tipping cows, however, soldiers with G Troop, 10th Cavalry tipped SA-2...