The citizen saboteur cannot be closely controlled, nor is it reasonable to expect that simple sabotage can be precisely concentrated on specific type of target according to the requirements of a concrete military situation. Check use materials, which appear to be innocent. A knife or nail file can be carried normally on your person. Either is multi purpose instrument for creating damage matches pebbles, hair, salt, nails,. Dozens of other destructive agents can be kept in your living quarters without even exciting any suspicion whatsoever. If you're using decentralized command, there are going to be times where you're like, okay, I got to do some damage control here.