While the Biden administration's Nuclear Posture Review (NPR) has proposed retiring the B83 megaton capable gravity bomb, the Pentagon is to examine nuclear and conventional options against hard and deeply buried targets (HDBT). The B83 has had "a dimishment of usefulness," and the NPR "does point out that we need to do more work to make sure we can get after some of the hard and deeply buried targets--the so called HDBT," Richard Johnson, the deputy assistant secretary of defense…
