Syria has been embroiled in a brutal civil war for nearly five years leaving over 250,000 Syrian civilians dead and half of the Syrian population displaced from their homes. This is a complicated war without two clear sides. In fact there are over 1,000 rebel groups comprised of 100,000 rebels fighting against the current regime.
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These groups are not unified and have varied agendas and ideology ranging from those who desire a democratic government, to those who are sympathetic to extremist groups like al-Qaeda. They do have one common enemy- the Syrian government and depending on the ideology of the group that is victorious in overtaking the Syrian government, the successor could be far more militant than the regime they seek to remove from power. This is why so many countries have a strong interest on which group comes out on top, with the U.S. even dropping 50 tons of ammunition and grenades to an unnamed rebel group.
Read more about the Syrian civil war:
BBC: Guide to the Syrian rebels
The Guardian: US freezing of Syrian rebel training scheme shows western disarray