The Boeing Co., Mesa, Arizona, was awarded a $321,800,000 cost-plus-incentive-fee undefinitized contract to complete development of the base line Apache attack helicopter, and for the integration of modifications. Work will be performed in Mesa, Arizona, with an estimated completion date of March 31, 2018. Bids were solicited with one received. Fiscal 2015 research, development, testing, and evaluation funds in the amount of $51,460,139 were obligated at the time of the award. Army Contracting Command, Redstone Arsenal, Alabama, is the contracting activity (W58RGZ-15-C-0043).