1951 ‘Dog’ test in Operation Buste…

1951 ‘Dog’ test in Operation Buster, with a yield of 21 kilotons of TNT, first U.S. nuclear field exercise conducted with live troops maneuvering on land. Troops shown are 6 mi from the blast. The Nevada Test Site was/is 65 miles NE of Las Vegas, 100 mi. from St. George, Utah.

via reddit