Support WBURThe U.S. used 'bunker buster' bombs in Iran. Here's what to know about themPlay03:32Download AudioKat LonsdorfRebecca RosmanUpdated June 22, 2025 ShareAirmen look at a GBU-57, or a Massive Ordnance Penetrator bomb, at Whiteman Air Force Base in Missouri on May 2, 2023. (AP)This article was originally published on June 18, 2025.