In this file US Navy handout image taken on October 4, 2014 two US Navy F-18E Super Hornets supporting operations against IS, are pictured after being refueled by a KC-135 Statotanker over Iraq after conducting an airstrike. At least 17 pro-Iran fighters were killed in US strikes in Syria at the Iraq border overnight, the Syrian Observatory for Human Rights said on February 26, 2021.