National Geographic : 1950 Sep
© National Geographic Society 313 Kodachrome from LeathernecK by Louis It. Lowery Marines Show How a Hovering Sikorsky "Windmill" Hoists Men to Safety from the Sea On Navy carriers, battleships, and most cruisers, helicopters answer the "man overboard" cry, transfer men from ship to ship, deliver mail, go scouting. During carrier take-offs and landings, they hover like guardian angels. Here the water is colored a vivid green by a dye used to attract rescue planes.