The Pentagon has admitted that U.S. warplanes fired depleted uranium munitions during air raids in Syria, despite a vow not to use the toxic and radioactive weapons in the battlefield. Foreign Policy magazine reported this week that Air Force A-10 attack planes fired more than 5,000 rounds of 30mm depleted uranium rounds during a pair of assaults on convoys in an ISIS-controlled part of eastern Syria in November 2015. Depleted uranium is both toxic and highly radioactive, and many medical experts have linked its use to cancer and birth defects.