American troops could face trial before Iraqi courts for major crimes committed off base and when not on missions, according to a draft security pact that has been put together after months of tortuous negotiations, Iraqi officials familiar with the document said Wednesday.

The draft also calls for U.S. troops to leave Iraqi cities by the end of June and withdraw from the country entirely by Dec. 31, 2011, unless the Baghdad government asks some of them to stay for training or security support.

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