When young garage mechanic Aidaroos Saleh heard the familiar ping of his smartphone, he could never have imagined the journey on which the incoming message would take him. In a matter of weeks, Saleh, 22, went from fixing cars in his adopted country of Saudi Arabia to the battle front of his southern Yemen homeland. The message was an official communication, a call to arms for Yemenis in Saudi Arabia to join a fighting force that would “defend Aden” — the southern Yemeni city that descended into civil war in mid-March. Four months after he responded to the message in April, the young fighter sat cradling an AK-47 assault rifle between his […]