 The MPWH does not add weight or cost and has a lighter composite missile mid-body to enable drop-in replacement to existing Javelin tubes.The Javelin F-model is planned to begin deliveries in early 2020; the improved missile design, along with new lighter CLU with an improved target tracker, entered production in May 2020.Most rocket launchers require a large clear area behind the gunner to prevent injury from backblast.