Kurdish fighters from the Popular Protection Units (YPG), wearing vests with the YPG logo, stand along a street in Aleppo's Sheikh Maqsoud neighborhood, June 19, 2013. Kurdish fighters from the Popular Protection Units (YPG) joined the “Free Syrian Army” to fight against forces loyal to Syria's President Bashar al-Assad. (Photo by Nour Kelze/Reuters)

Women, who are part of the Sawt al-Haq (Voice of Rights), take aim with their weapons as they undergo military training in Aleppo February 17, 2013. (Photo by Muzaffar Salman/Reuters)

Um Jaafar, a woman fighter in the Free Syrian Army, rests while undergoing military training with other women in Aleppo February 17, 2013. Um Jaafar was a women's hairdresser before the revolution and was trained by her husband Abu Jaafar, a Sawt al-Haq battalion commander, to be part of Sawt al-Haq. (Photo by Muzaffar Salman/Reuters)

Guevara, a Syrian Palestinian woman married to an Al Wa'ad battalion commander, is pictured in Aleppo January 19, 2013. Guevara was the director of a secondary school before the revolution and is now one of the main snipers of the battalion on the front line in Aleppo. (Photo by Muzaffar Salman/Reuters)

Guevara, a Syria Palestinian woman married to an Al Wa'ad battalion commander, is pictured in Aleppo January 19, 2013. (Photo by Muzaffar Salman/Reuters)

A female member of the “Mother Aisha” batallion gestures as she holds a weapon in Aleppo's Salaheddine district, September 19, 2013. (Photo by Loubna Mrie/Reuters)

Guevara (L), a Syrian Palestinian woman married to an Al Wa'ad battalion commander, is pictured in Aleppo January 19, 2013. (Photo by Muzaffar Salman/Reuters)

Female members of the “Mother Aisha” battalion sit together along a street in Aleppo's Salaheddine district, September 19, 2013. (Photo by Loubna Mrie/Reuters)

Women, who are part of the Sawt al-Haq (Voice of Rights), stand with their weapons as they undergo military training in Aleppo February 17, 2013. A group of women are undergoing military training to form the Nazek Obeid group as part of the Sawt al-Haq battalion, which is based on the frontline of Aleppo's Sheikh Saeed neighbourhood. (Photo by Muzaffar Salman/Reuters)

An armed Kurdish fighter from the Popular Protection Units (YPG) walks past Kurdish graffiti in Aleppo's Sheikh Maqsoud neighborhood, June 19, 2013. Kurdish fighters from the Popular Protection Units (YPG) joined the “Free Syrian Army” to fight against forces loyal to Syria's President Bashar al-Assad. (Photo by Nour Kelze/Reuters)

Abu al-Taib, the leader of Ahbab Al-Mustafa Battalion, demonstrates to female members as he holds a gun during a military training in a mosque in the Seif El Dawla neighbourhood in Aleppo June 24, 2013. (Photo by Muzaffar Salman/Reuters)

A female member of the Ahbab Al-Mustafa Battalion holds a rifle during military training in a mosque in the Seif El Dawla neighbourhood in Aleppo June 24, 2013. (Photo by Muzaffar Salman/Reuters)

Women, who are part of the Sawt al-Haq (Voice of Rights), hold a weapon as they undergo military training in Aleppo February 17, 2013. A group of women are undergoing military training to form the Nazek Obeid group as part of the Sawt al-Haq battalion, which is based on the frontline of Aleppo's Sheikh Saeed neighbourhood. (Photo by Muzaffar Salman/Reuters)

Um Jaafar, a woman fighter in the “Free Syrian Army”, and her husband Abu Jaafar, a Sawt al-Haq (Voice of Rights) battalion commander, prepare their weapons before heading to the frontline, in Aleppo February 12, 2013. Um Jaafar was a women's hairdresser before the revolution and after being trained by her husband, is now a member of a Sawt al-Haq battalion on the frontline of Aleppo's Sheikh Saeed neighbourhood. (Photo by Muzaffar Salman/Reuters)

A female member of the “Mother Aisha” battalion receives instruction as she holds a rifle during military training in Aleppo's Salaheddine district, September 19, 2013. (Photo by Loubna Mrie/Reuters)

A female member of the “Mother Aisha” battalion receives instruction as she holds a rifle during military training in Aleppo's Salaheddine district, September 19, 2013. (Photo by Loubna Mrie/Reuters)

A female member of the Ahbab Al-Mustafa Battalion stands on a pick-up truck mounted with an anti-aircraft weapon as she undergoes military training in Aleppo's Salaheddine district June 24, 2013. (Photo by Muzaffar Salman/Reuters)

A female member of the Ahbab Al-Mustafa Battalion holds a gun as she undergoes military training in Aleppo's Salaheddine district, June 24, 2013. (Photo by Muzaffar Salman/Reuters)

Guevara, a Syrian Palestinian woman married to an Al Wa'ad battalion commander, runs in Aleppo January 19, 2013. (Photo by Muzaffar Salman/Reuters)

Kurdish female members of the Popular Protection Units stand guard at a check point near the northeastern city of Qamishli, Syria, Sunday, March 3, 2013. (Photo by Manu Brabo/AP Photo)

Fighters in the Kurdish militia known as the Popular Protection Units line up in formation in front of supporters in Ras Al Ayn, Syria, on April 14, 2013. (Photo by Danny Gold/NBC News)