"child-soldier Omar Khadr "
Sorry, but Omar Khadr does not meet the  UN definition of a child soldier.  He was neither kidnapped or otherwise forced into joining an army. 
We was an active terrorist who worked in an improvised explosive device (IED) factory (there is a video of him with primer cord) for the purpose of killing Canadians and their allied.  
He stated, on capture, that he wanted to get rich by killing Americans, and now, thanks to the Liberals, he has succeeded. 
A better expression would be traitor.

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