Yemeni fighter Hassan Saleh, left, identifies a target for a fighter during clashes with Houthi rebels on the Kassara front line near Marib, Yemen, Sunday, June 20, 2021. On the most active front line in Yemen's long civil war, the months-long battle for the city of Marib has become a dragged-out grind with a steady stream of dead and wounded from both sides. (Photo by Nariman El-Mofty/AP Photo)
