The Pentagon is eyeing cuts in a war office thought to be untouchable: the organization that devises ways to foil the No. 1 killer of US troops in Afghanistan. Officials say the Joint Improvised Explosive Device Defeat Organization has done good work in developing jammers and detection equipment to neutralize the enemy's use of roadside bombs. But observers inside and outside the Pentagon say JIEDDO has become unwieldy, with too many private contractors and duplicate programs.