A Sikorsky R-5 helicopter from the US Air Force 3rd Air Rescue Squadron is shown as it settles down to take on an injured soldier before transporting him to one of the Mobile Army Surgical Hospital (MASH) units at the rear. According to the 2003 book Whirlybirds: U.S. Marine Helicopters in Korea, “the mortality rate in Korea fell to a new low of only 2%, less than half the rate of World War II and far below the nearly 50% rate prior to the American Civil War, due in large part to the rapid evacuation of the seriously wounded and the immediate availability of helicopter-provided whole blood at forward medical stations.”