On February 17, three British teenagers left their East London homes and boarded a plane for Turkey. Soon afterwards, they crossed into Syria, where they are believed to have joined the Islamic State militant group (al-Jazeera, February 21). This event has put female radicalization in the spotlight. Despite the extensive press coverage, however, the individuals—Shamima Begum, 15, Kadiza Sultana, 16, and Amira Abase, 15—are only the latest women to leave their homes in the West with the intention of joining the Islamic State. Notable others include Zehra Duman (a.k.a. Umm Abdullatif), a 21-year-old Australian of Turkish background, who joined the Islamic State with her husband, and a 33-year-old Dutch-Chechen woman who took her children to Syria to live under the Islamic State last October (Daily Telegraph [Australia], April 1; NOS, March 16). This article will look at the evolution of such female migration to the Islamic State and explain how and why women are becoming a key strategic asset for the group.