PROMONTORY — Despite an explosion that led to the total loss of a building at the Northrop Grumman complex near Promontory last week, the company said work on solid rocket motor projects will ...

This photo provided by the Box Elder County Sheriff's Office shows the wreckage from an explosion at Northrop Grumman's remote rocket testing site on Wednesday, April 16, 2025, in Promontory ...

PROMONTORY, Box Elder County — An explosion rocked the Northrop Grumman rocket testing facility in remote Promontory, around 32 miles west of Brigham City. Reports of the explosion came in ...