CBS News Special Report (2017- )

Senior Pentagon officials revealed new details about the U.S. operation to bomb three nuclear sites in Iran, with the chairman of the Joint Chiefs of Staff saying it was the "largest B-2 operational strike in U.S. history" and inflicted "extremely severe damage and destruction" to the targets.

"This was a highly classified mission with very few people in Washington knowing the timing or nature of this plan," Gen. Dan Caine, the chairman, said in a briefing at the Pentagon Sunday morning detailing the strikes against the Iranian nuclear sites at Fordo, Natanz and Isfahan.

Caine said the mission, dubbed Operation Midnight Hammer, included seven B-2 Spirit bombers that flew east from their base in Missouri to Iran. The 18-hour flight required multiple in-flight refuelings, and the bombers met up with U.S. fighter jets and support aircraft once over land in the Middle East in a "complex, tightly timed maneuver," Caine said.