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B2.1 is a test vehicle made with a ship thrust dome and a booster aft skirt. The purpose of this unusual tank is not clear.
The B2.1 test tank conducted a cryogenic proof test.
The B2.1 test tank conducted a cryogenic proof test.
The B2.1 test tank conducted a cryogenic proof test. This was the first usage of the orbital tank farm for testing.