Engineering firm Aecom in Century City announced a subsidiary has won a $3 billion federal contract to supply operation and maintenance services to the U.S. Air Force.

The 15-year, $3.1 billion cost-plus-award-fee contract was awarded to JT4 Limited Liability Co. for joint range technical services, which includes providing services for operating, maintaining and sustaining the western test and training ranges at the 412th Test Wing and the Naval Air Warfare Center Weapons Division in California, the Utah Test and Training Range, the Nevada Test and Training Range and the Space Test and Training Range in Colorado. The contract is expected to run through to April 15, 2033, according to Aecom.

“Leveraging our expanded capabilities and scale, this substantial award underscores the continued transformational backlog growth that we are driving in our management services business, our highest-margin segment.” said Michael Burke, Aecom’s chief executive officer.

JT4 Limited Liability has provided services to the Air Force through the joint range technical program for “many years,” according to John Vollmer, president of Aecom’s management services group.

The contract value will be added to Aecom’s backlog for the third quarter of fiscal year 2018, the company said.