CEDAR RAPIDS, Iowa (AP) — Federal antitrust regulators reviewing the proposed merger of defense contractors United Technologies Corp. and Raytheon have requested that United Technologies unit Collins Aerospace sell its Cedar Rapids-based military GPS business.

The Gazette reports that the GPS business employs hundreds in Cedar Rapids.

In a Monday email, employees were notified that regulatory agencies asked the company to explore the divestiture of the Rockwell Collins operation “to satisfy certain competitive concerns.”

Phil Jasper with Collins Aerospace said in the email that the company has not yet determined a buyer or timing for a transaction.

Jasper says employees who might be affected will be notified this week.

Collins Aerospace, headquartered in West Palm Beach, Florida, was created last year with the merger of UTC Aerospace Systems and Rockwell Collins.