Project 56
1950 CE.
Shown on the map at 39.936°, -115.897°.
Operation Project 56 was a series of 4 nuclear tests conducted by the United States in 1955–1956 at the Nevada Test Site. These tests followed the Operation Wigwam series and preceded the Operation Redwing series.
Text from the Wikipedia article Project 56 (nuclear test), licensed CC BY-SA 4.0.