Operation Cornerstone

Cornerstone
Information
Country	United States
Test site	NTS Area 12, Rainier Mesa; NTS Area 19, 20, Pahute Mesa; NTS, Areas 1-4, 6-10, Yucca Flat
Period	1988-1989
Number of tests	11
Test type	underground shaft, underground tunnel
Max. yield	150 kilotonnes of TNT (630 TJ)
Test series chronology
← Operation Touchstone Operation Aqueduct →

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The United States's Cornerstone nuclear test series was a group of 11 nuclear tests conducted in 1988-1989. These tests followed the Operation Touchstone series and preceded the Operation Aqueduct series.

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