MORE ON WARLOCK'S TRICKS It's not much. But I've got a leeetle more information on the military's hush-hush defense against improvised explosive devices, or IEDs.The Warlock radio frequency jammers are made by the New York and Simi Valley firm EDO. And they're based on an earlier EDO product called the Shortstop Electronic Protection System, which is designed to protect troops against proximity-fused weapons, like mortar rounds and artillery shells. According to EDO, Shortstop grabs the electronic signal that one of these weapons makes, "modifies the signal and sends it back to the weapon making the fuze think it is...