Completed your mission? it means that you will go home and you have nothing more to do. Why prime ministers and Presidents do not retire/quit jobs when reaching 60 of their ages (retirement age in most countries), are they made of different cloth? May be if you go home some other one (which I doubt) would replace you and conclude peace with Palestinians.
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Turkey ends 'successful' military operations against Kurdish militants in Cizre (AP)
from the article: Netanyahu: Shalit's release means I have accomplished my mission