A fighter from Jaish al-Islam (Islam Army), the foremost rebel group in Damascus province who fiercely oppose to both the regime and the Islamic State group, fires in Harasta Qantara, near Marj al-Sultan on the eastern outskirts of Damascus, on January 23, 2016, during clashes with government forces after they infiltrated into the government-held area. / AFP / AMER ALMOHIBANY        (Photo credit should read AMER ALMOHIBANY/AFP/Getty Images)