Syrian rebel fighters stand on a tank they took after storming a military base in Aleppo, Syria, on Monday, Nov. 19, 2012. (AP Photo/Khalil Hamra)

Photo by: Khalil Hamra

Syrian rebel fighters stand on a tank they took after storming a military base in Aleppo, Syria, on Monday, Nov. 19, 2012. (AP Photo/Khalil Hamra)