Northrop Grumman's Utah facility manufactures and tests solid rocket engines, like those used to launch NASA's Space Launch System (SLS) rocket for the Artemis Program. Their campus spans over 10 miles (16 kilometers) of Utah desert, northwest of Promontory, with two central hubs of facilities.

Crews are investigating an explosion Wednesday morning at Northrop Grumman's rocket test facility in Promontory, a remote location in Box Elder County.