Lockheed Martin will celebrate the 60th anniversary of its aeronautics facility in Marietta on Thursday with a commemorative pictorial postmark.

Lockheed executives will host the ceremony and postmark unveiling for employees. The U.S. Postal Service will set up a temporary postal station at the facility to allow employees to receive the postmark on items to be mailed.

The temporary Lockheed postmark is only good for Thursday’s date, and anyone wanting a commemorative copy of the postmark must notify the postal service within 30 days.