A sailor signals to a Sikorsky MH-60S Seahawk helicopter on the flight deck of the amphibious assault ship USS Boxer during Dawn Blitz 2015 exercises in the Pacific Ocean on September 6, 2015. The Seahawk is assigned to Helicopter Sea Combat Squadron 23. United Technologies' sale of Sikorsky Aircraft to Lockheed Martin cleared the required Hart-Scott-Rodino antitrust waiting period, one of the requirements for Lockheed Martin to complete its purchase of the Stratford-based helicopter manufacturer.