Operation Sandstone was a series of nuclear weapon tests in 1948. It was the third series of American tests, following Trinity in 1945 and Crossroads in 1946, and preceding Ranger. Like the Crossroads
Briefing on the USS Mount McKinley. Pictured are Colonel T. J. Sands, Captain James S. Russell, Dr. D. K. Froman, Brigadier General David A. Ogden, Major General J. D. Barker, Major General W. E. Kepner, Lieutenant General John E. Hull, Rear Admiral William S. Parsons, Rear Admiral Francis C. Denebrink, and Brigadier General Claude B. Ferenbaugh.