The 30,000-pound guided bomb is designed to penetrate an estimated 200 feet through rock or other hard substances before destroying enemy labs or bunkers.
U.S. and Iranian officials convened in Oman on Friday, opening the door to a modest easing of tensions even as American warships mass in the Arabian Sea.
The Air Force's secretary and chief of staff have made improving readiness a top priority and emphasize it is "commanders' business," Lt. Gen. Pleus said.