Project 57 was an open-air nuclear test conducted by the United States at the Nellis Air Force Range in 1957,[1][2] following Operation Redwing, and preceding Operation Plumbbob. The test area, also known as Area 13, was a 10 miles (16 km) by 16 miles (26 km) block of land abutting the northeast boundary of the Nevada National Security Site.[3]