Syrian rebels say they captured an important military air base in northern Syria on Tuesday. Here, rebels sit behind an anti-aircraft weapon in the northern city of Aleppo on Friday. Abdullah al-Yassin/AP hide caption

itoggle caption Abdullah al-Yassin/AP

A Syrian rebel prays on a street in the northern city of Aleppo in January. Many Syrians are debating what role Islam should play in Syria if the current secular government is toppled. Muzaffar Salman/Reuters/Landov hide caption

itoggle caption Muzaffar Salman/Reuters/Landov

Activists in the town of Saraqib, Syria, hold a poster that reads, "Sheikh Moaz al Khatib represents me." Courtesy of Mahmoud Bakkour hide caption

itoggle caption Courtesy of Mahmoud Bakkour

Many Syrians in the capital Damascus are feeling cooped up by the ongoing war. Here, a woman and her child who fled the fighting in their home area take refuge at a school in Damascus last September. Muzaffar Salman/AP hide caption

itoggle caption Muzaffar Salman/AP

Two young Syrian activists, Mohsen and Sara, say they met and fell in love on Facebook while monitoring the country's uprising. They didn't want their faces shown, but provided this photo, taken in the Old City of Damascus. Courtesy of Mohsen and Sara hide caption

itoggle caption Courtesy of Mohsen and Sara

A Syrian rebel fighter in the northeastern Syrian border town of Ras al-Ayn on Nov. 11. The rebels and a Kurdish militia in the town both oppose President Bashar Assad's regime, but they have been fighting each other in recent days. Murad Seezer/Reuters/Landov hide caption

itoggle caption Murad Seezer/Reuters/Landov

A man makes bread as residents, background, stand in line in front of a bakery during heavy fighting between Free Syrian Army fighters and government forces in Aleppo, Syria, on Dec. 4, 2012. Narciso Contreras/Associated Press hide caption

itoggle caption Narciso Contreras/Associated Press