Boeing joined the wing assembly and fuselage of the first P-8A Poseidon for the U.S. Navy on May 1, 2008 in Renton, Washington. Boeing Integrated Defense Systems (IDS) and Boeing Commercial Airplanes (BCA) are working together to build the P-8A, a military derivative of the 737-800, on a new final assembly line. The factory's third line takes advantage of the proven efficiencies, manufacturing processes and performance of the highly reliable Next-Generation 737. The Navy plans to purchase 108 P-8As to replace its fleet of P-3C aircraft. Initial operational capability is slated for 2013. The P-8A will provide increased capability in long-range anti-submarine warfare, anti-surface warfare, intelligence, surveillance and reconnaissance.