slowly damaged engines, that agent could be far away by the time the enemy determines what had happened. Carefully planned sabotage can be one of the safest tactics for an UW force. Sabotage is usually carried out clandestinely by the underground or auxiliary, but it can be carried out by the guerrilla force, under the cover of a combat operation. For example, while a raid on an airfield was in progress, and all available guards were fighting the main raid, guerrillas might infiltrate to the fuel tank farm and introduce contaminants into some of the tanks. SF teams must take great care, especially in failed or failing states with crumbling infrastructure, not to enable dissidents to create hardship for the general population. An excellent example, which reflects societal characteristics that might not be obvious to Americans, is sabotaging an airfield that provides a widely used commodity that must be fresh, such as khat in Somalia. Subversion Subversion is formally defined as "action designed to undermine the military, economic, psychological, or political strength or morale of a regime." In an insurgency, it will almost certainly be carried out by members of the underground or auxiliary, who have gained the trust of the enemy. Support to the UW force Strike support In the organization chart, there is a dotted line to the UCC air command, which normally controls both Air Force and Navy aircraft in the region, and may have air assets based in the U.S. detailed to them. The military staff of the guerrilla government might, assuming U.S. involvement is known, request a U.S. air strike on some target that the guerrillas cannot destroy, or perhaps even reach. Such strikes are not a panacea, as an air strike with civilian casualties will turn the essential political dynamic against the guerrilla force. Communications Communications security is critical. New Special Forces software-defined radios, such as the AN/PRC-148 Joint Tactical Radio System (JTRS) Inter/Intra Team Radio (JITR) are easily portable, secure and flexible, but capture of such a unit, in the early phases of an operation, confirms U.S. involvement. Tactical radios used internally by the UW force are even more vulnerable to capture. When U.S. involvement is known, however, the latest technology is routinely used. As a consequence, SF communications specialists must be competent with old but deniable radio communications, including those using Morse Code or field-improvised antennas in the high frequency (HF) range.