 The nearest tower FLIR camera then is cued to the threat signature, giving the operator real-time video within 2 seconds of detection.When not in RLS mode, the FLIR cameras are available to the operator as surveillance cameras.Mortar launches do not produce as strong an electro-optical signature as does a rocket, so RLS relies on acoustic signature cueing from an Unattended Transient Acoustic Measurement and Signal Intelligence System (UTAMS).