Taliban fighters fired two rockets at a U.S.-led coalition military base in Khost province, The National reported March 31. There were no casualties, but this marks the first attack on U.S. forces by the Taliban in over a year, when both sides signed the Doha Agreement. Why It Matters: The risk for similar attacks will increase as the May 1 deadline draws nearer, which will put more pressure on the U.S. to withdraw and could create room for security threats to proliferate. The Taliban has repeatedly emphasized that a troop withdrawal is mandatory for peace talks to move forward. Increasing U.S.-Taliban hostilities will also ease pressure on the Islamic State, which maintains a presence in Afghanistan and could pose a greater threat in Kabul and eastern Afghanistan.