One of the key US men in Syria, the “Free Syrian Army” (FSA) Col. Abdel Jabbar al-Okaidi, who operated mostly in the Greater Aleppo area, was open about his daily communication and collaboration with extremist jihadists from the “Islamic State in Iraq and the Levant” (ISIL) and al-Qaeda’s official branch in Syria, Jabhat al-Nusra. He refers to their fighters as brothers. In one footage after the rebel capture of Menagh military airbase, he even appeared standing next to an Egyptian jihadist from ISIL, Abu Jandal, while thanking him and his group for their contributions. The US is known to have funneled military aid to al-Okaidi and others in the FSA throughout the last couple of years.
Sources: Telegraph, Orient News, Souria al-Shaab