United States, Oct. 27 -- Lockheed Martin Corp., Fort Worth, Texas, is awarded a $13,259,000 cost-plus-fixed-fee, level-of-effort modification (P00006) to a previously awarded delivery order (N0001925F0120) under a basic ordering agreement (N0001924G0010). This modification definitizes the undefinitized contract action established under the base delivery order and adds 50,000 labor hours to continue integration efforts for the F135 engine core upgrade and support the transition of the power thermal management upgrade into the preliminary design phase.The work supports the Air Force, Marine Corps, Navy, and F-35 Cooperative Program Partners. Work will be performed in Fort Worth, Texas (47%); Torrance, California (13%); El Segundo, California...