The new head of the exiled opposition, Hadi Bahra, has served as chief negotiator at the failed peace talks with the government of Syrian President Bashar Assad in February in Geneva.
Bahra succeeds Ahmed al-Jarba, who has already served two six-month terms, the maximum period allowed by the coalition, which is based in Turkey.
The exiled opposition block hardly has any backing from people inside Syria with the conflict there now well in its fourth year. Also, the block only nominally controls nationalist-minded rebels that in many parts of Syria been overrun by Islamic extremist groups, including the Islamic State group.
The Syrian conflict began in March 2011 as largely peaceful protests against Assad's rule. It morphed into an armed revolt after some opposition supporters took up arms to fight a brutal government crackdown on dissent.
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It became a civil war, pitting largely Sunni Muslim rebels against an Assad's government that is dominated by Alawites, a sect in Shiite Islam.
Islamic extremists, including foreign fighters and Syrian rebels who have taken up hard-line al-Qaida-style ideologies, have played an increasingly prominent role among the fighters, dampening the West's support for the rebellion to overthrow Assad.
More than 160,000 people have been killed in the Syrian conflict and nearly a third of the population of 23 million has been displaced by fighting. A third of the dead are thought to be civilians.