At this moment, nearly every major Department of Defense program seems to be struggling. Technological bottlenecks, industrial capacity problems, workforce issues, and general bureaucratic confusion have produced delivery delays and cost overruns, even as the entire defense industrial base faces the challenge of competing with Russia and China. The major exception to these problems appears, surprisingly enough, to be the B-21 Raider. The purpose of the B-21 program was to produce a new generation of strategic bombers to replace the B-1B Lancer and the B-2 Spirit. The subsonic B-21 is designed to use stealth to penetrate enemy air defenses and...