According to the article written by the Huffington Post, the United States military is testing to see if any chemical agents were used in an attack in Iraq that came within meters of U.S. forces. Fortunately, no persons from the U.S. were injured in the attack. It fell near a base where U.S. forces are working hard to prepare an airfield to take back the city of Mosul from the radical group. Tests are underway to look at the tar-like substance that tested positive for mustard agent. United States forces have used multiple airstrikes to take out the Islamic States chemical reserves.