The U.S. is uninviting China from participating in a large naval exercise in the Pacific. The move is in response to what the Pentagon calls the Chinese militarization of islands in the disputed South China Sea, a major trade route and an area with multiple overlapping territorial claims. The Rim of the Pacific or REMPAC exercise is held every two years in Hawaii in June and July and China has taken part in the past. Pentagon spokesman Lieutenant Colonel Christopher Logan said there is strong evidence China has set up anti-ship missiles and electronic jammers to some of the islands. China has called the rescinded invitation a "very unconstructive move."