赤ひげ
In July 1957, the Australian Government was informed of the UK authorities' decision to limit Operation Antler to just three tests. There would be two tower tests of and , codenamed Tadje and Biak respectively, and only one balloon test, a test codenamed Taranaki. Helping the Pixie test (which became known as Tadje) remain on the schedule was the deletion of Red Beard tests. It was decided that the third test would be of a Red Beard with a composite uranium-plutonium core, which had not yet been tested, while the pure plutonium Red Beard would go into production without further testing.