In this photograph taken on April 11, 2017, an Afghan security force personnel fires during an ongoing an operation against Islamic State (IS) militants in the Achin district of Nangarhar province. An American special forces soldier has been killed while conducting operations against the Islamic State group in Afghanistan, the US military said. The US-backed Afghan military has vowed to wipe out the group in its strongholds in the eastern province of Nangarhar as IS challenges the more powerful Taliban on its own turf. / AFP PHOTO / NOORULLAH SHIRZADA