Northrop Grumman already has a big footprint in Brevard County, and now the company has announced that it plans to expand its presence at the Melbourne Orlando International Airport, where more than 5,000 employees already work on high-tech programs… among them, the U.S. Air Force’s B-21 Raider long-range nuclear stealth bomber. Northrop Grumman has announced plans to exercise a lease option on about 15 acres of land currently owned by the airport along NASA Boulevard. Construction is expected to begin within six months.