PALMDALE, Calif.—The Pentagon is poised to show off its first new bomber in more than 30 years, lifting the veil on the secret long-range jet intended as a central element in Washington’s effort to keep China in check.

Defense giant Northrop Grumman Corp. on Friday will provide a glimpse of one of the new B-21 Raider jets at a government facility north of Los Angeles, where its most sensitive military projects are developed and built, ahead of an expected first flight next year.

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