The Tumbler phase, sponsored by the Atomic Energy Commission, consisted of three airdrops intended to help explain discrepancies in the actual and estimated blast shock wave damage noted on previous detonations and to establish more accurately the optimal height of burst.

The Snapper phase, sponsored by the Department of Defense, consisted of one airdrop and four tower shots intended to test various new weapons developments.

[1] The military exercise Desert Rock IV, involving 7350 soldiers, took place during the test series.

Of particular note is shot George, which contaminated more citizens than any other nuclear test in the United States.

George alone accounted for some 7 percent of all population exposure to radiation during the 1,032 nuclear tests performed by the United States.