Northrop Grumman operates a large complex on the northeast end of Plant 42, which includes the largest single structure on base, an assembly hall with a footprint covering close to a million square feet. This was built for the B-2 stealth bomber, which was assembled here, from parts produced all over the country, but principally from Northrop Grumman’s plant at Pico Rivera. Currently under production is the B-21, the latest generation of the long-range stealth bomber, unveiled here in 2022, and currently undergoing flight testing at Edwards Air Force Base. The buildings on the west side of the Northrop Grumman site are focused more on UAV programs. Facilities there were first used by General Dynamic’s Convair for assembling fighter jets in the mid 1950s, and have been used since the 1990s as a development and assembly site for Teledyne-Ryan’s Global Hawk UAV. Teledyne was acquired by Northrop Grumman in 1999, and the company’s UAV assembly and testing programs continue here.