By Idrees Ali FORT LEONARD WOOD, Mo. (Reuters) - The United States is continuing to talk with ally Turkey on the role it will play in the operation to seize the city of Raqqa, Islamic State's main stronghold in Syria, U.S. Secretary of Defense Ash Carter said on Wednesday. Carter's comments, made during a news conference, come days after Turkey said it wants the Raqqa operation to start after Mosul and Euphrates Shield operations have been completed. "We'll continue to talk with Turkey about its role in the eventual seizure of Raqqa, but we're proceeding now with the operation according to our plan," Carter said.
