 These solid fuel thermonuclear bombs were far easier to handle, requiring no cryogenic temperature materials or cooling system.It was replaced with the five EC-14 weapons brought up to an acceptable standard as the TX-14 and production Mark 17 nuclear bombs in mid-1954.The planned test of the TX-16 bomb in the Castle Yankee test of Operation Castle was canceled due to the spectacular success of the "Shrimp" device in the Castle Bravo test.