FACTOR SUBSTITUTION. Darren Kaplan (via InstaPundit) sees it at work in Iraq. Here's a testable hypothesis. Start with "We'll know that jammers have come into widespread use when we begin to see increased uses of other methods of attack such as suicide bombings and truck bombings of stationary targets (which I think we've already seen). What we will not see more of is increased attacks on U.S. convoys using small arms such as rifles and RPGs, those attacks proved to be suicidal for the attackers and have now been largely abandoned by the insurgents unless they happen upon isolated vehicles as targets of opportunity." If memory serves, you get your 72 virgins by dying. There is no clause limiting the virgins to those who throw the micro-switch on a bomb-vest or fly a plane into a building. To the extent that the insurgents abandoned small arms, they might be revealing a preference for something other than assured martyrdom.