WASHINGTON (Reuters) - In a surprise move, the U.S. Navy (news - web sites) has chosen a transatlantic team led by Lockheed Martin Corp. to build a new U.S. presidential helicopter fleet in a deal valued at well over $1 billion, several congressional sources said on Friday. The decision was a stunning setback for Connecticut-based United Technologies Corp.'s Sikorsky Aircraft unit -- which for nearly 50 years has built and maintained the green and white "Marine One" helicopters that fly the president. Sen. Charles Schumer (news, bio, voting record), a New York Democrat, announced the decision in a press release,...