SAN DIEGO (NNS) -- The Navy accepted delivery of USS Zumwalt (DDG 1000), the lead ship of the Navy's next-generation of multi-mission surface combatants, on April 24, 2020. Following this delivery, the ship will transition from Combat Systems Activation to the next phase of developmental and integrated at-sea testing. This event marks a major milestone of the dual delivery approach for USS Zumwalt, which achieved Hull Mechanical & Electrical delivery from shipbuilder General Dynamics' Bath Iron Works in May 2016. Raytheon Integrated Defense Systems was the prime contractor for the Zumwalt Combat System, and has lead activation and integration for Zumwalt class ships both in Bath, Maine and San Diego. "Delivery is an important milestone for the Navy, as DDG 1000 continues more advanced at-sea testing of the Zumwalt combat system," said Capt. Kevin Smith, DDG 1000 program manager, Program Executive Office, Ships. "The combat test team, consisting of the DDG 1000 sailors, Raytheon engineers, and Navy field activity teams, have worked diligently to get USS Zumwalt ready for more complex, multi-mission at-sea testing. I am excited to begin demonstrating the performance of this incredible ship." With delivery, USS Zumwalt joins the U.S. Pacific Fleet battle force and remains assigned to Surface Development Squadron One. In addition to at-sea testing of the Zumwalt combat system, DDG 1000 will also operate as a key enabler in the acceleration of new warfighting capabilities and rapid development and validation of operational tactics, techniques, and procedures. At a cost of $7.5 billion each and five years behind construction, it had it's critics as to the future in naval stealth capability and cost overruns. Two more of these Zumwalt class guided missile destroyers have been built but the other 29 ordered were cancelled due to the extreme high cost to U.S. taxpayers.