Lockheed Martin Corp. in Colorado Springs has been awarded a $3.9 million expansion of an Air Force contract to operate and maintain information technology networks for air defense, missile warning and space defense systems used by the Northern Command and the North American Aerospace Defense Command.

The Air Force Life Cycle Management Center made the latest award to extend an earlier contract to track and share data on orbiting space assets and debris.

Lockheed spokesman Chris Thorn said the company will complete the work with existing staff; the company and its subcontractors have more 500 people working on the related Integrated Space Command and Control System contract.

Lockheed was honored in November for its work on the contract by Aviation Week magazine.