Priority of Hard and Deeply Buried Target Defeat

TOPIC SPONSOR: AF/A10C

What priority should a Hard and Deeply Buried Target (HDBT) defeat capability take within U.S. nuclear strategy? How important is it that U.S. nuclear forces continue to be able to deny adversary sanctuary and hold critical protected targets at risk for each of these countries? Is there any potential adversary that finds this capability either critically influential or irrelevant in their decision calculus? What role should an HDBT defeat capability play, if any, in U.S. employment strategy?