The aerospace company, which is the primary contractor for the rocket's large core stage, issued the notifications as part of the Worker Adjustment and Retraining Notification (or WARN) Act, which requires US employers with 100 or more full-time employees to provide a 60-day notice in advance of mass layoffs or plant closings.

A 60-day notice of involuntary layoffs will be issued to affected employees by the Seattle-based aerospace manufacturer in the coming weeks.

About 400 workersat Boeing’s Space Launch System moon rocket program are set to lose jobs after the US planemaker warned on Saturday of layoffs due to revisions to NASA's Artemis program and cost expectations.