With the heart of ISIS’s self-proclaimed “caliphate” in Mosul in ruins and Secretary of Defense James Mattis in Baghdad to assess the U.S.-led campaign against the terror group, Iraqi security forces are working overtime to expunge more than 2,000 militants from the strategically crucial city of Tal Afar. The offensive could signal “the end of ISIS’s military presence” in the country’s northern region, according to a spokesman for the U.S. coalition, but the ISF and their Western military partners have run into a familiar obstacle: American-made anti-tank weapons.