Operation Polka Dot

Operation Polka Dot was a U.S. Army test of a biological cluster bomb during the early 1950s.
Operation.
Operation Polka Dot was a field test of the E133 cluster bomb undertaken at Dugway Proving Ground in Utah during the early 1950s. The operation was detailed in a July 18, 1955 U.S. Army report that also detailed Operation Trouble Maker. The operation was classified "secret" and involved filling the munitions with the biological agent simulant, "Bacillus globigii".