Syria's rebels: 20 things you need to know - CNN.com

Syria's rebels: 20 things you need to know - CNN.com: (CNN) -- Big questions loom over the debate on whether the United States should strike Syria: Who are the Syrian rebels? Should the United States and other countries help them?

The first thing to know is that the rebels aren't all playing on the same team. They're arrayed against the Syrian government in a constellation of groups and factions, each with its own agenda. Some are in league with al Qaeda