 Keeping spare parts at the squadron-level is usually not standard operating procedure, but these rules are frequently relaxed during intense operations due to the need for expedient turn-around.In addition to their separate duties as electronics technicians, O-level AT's are sometimes combined with aviation electrician's mates and aviation ordnancemen into a work center called IWT (integrated weapons team).As electronics have migrated into other aircraft systems (such as flight control and weapons control), the IWT team is given the duties of maintaining specifically the armament and weapons systems, whereas a separate AT workcenter is responsible for non-weapons based electronics such as communications and navigation.