The Thales Watchkeeper WK450 is an unmanned aerial vehicle (UAV) for all weather, intelligence, surveillance, target acquisition, and reconnaissance (ISTAR) used by the British Army. It is provided under an £800 million contract with UAV Tactical Systems (U-TacS), a joint venture of Elbit and Thales UK, and is based on Elbit's Hermes 450.

Elbit Systems Ltd. is an Israel-based international military technology company and defense contractor. Founded in 1966 by Elron, Elbit Systems is the primary provider of the Israeli military's land-based equipment and unmanned aerial vehicles.