 In August 2007, the USMC increased its order of CH-53Ks from 156 to 227.In 2007, first flight was planned for November 2011 with initial operating capability (IOC) by 2015.When the CH-53K enters service, it will serve as the USMC's heavy lift helicopter with the MV-22 (medium lift) and UH-1Y (light lift).