In February 2008, the U.S. Navy adjusted the contract so the last 40 AH-1Zs were built as new airframes instead of the previously planned rebuild of AH-1Ws. In September 2008, the Navy requested an additional 46 airframes for the Marine Corps, bringing the total number ordered to 226. In 2010, the Marine Corps ordered 189 AH-1Zs, with 58 of them being new airframes, with deliveries to continue until 2022. On 10 December 2010, the Department of the Navy approved the AH-1Z for full-rate production.