In this May 2004, file photo, a plume of smoke rises over the Eglin Air Force Base reservation in Fort Walton Beach, Fla., during a test of the GBU-43B, or massive ordnance air blast (MOAB) weapon, which contains 11 tons of explosives. U.S. forces in Afghanistan struck an Islamic State tunnel complex in eastern Afghanistan on Thursday, April 13, 2017, with a GBU-43B, the largest non-nuclear weapon ever used in combat by the U.S. military, Pentagon officials said. (Northwest Florida Daily News via AP) ** FILE **
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