As 21st Army Group began to overrun the V-1 launching sites in Northern France, the Luftwaffe turned to launching the missiles from aircraft over the North Sea, and 1 AA Group's Diver Box was heavily engaged. It was largely equipped with Mark IIC 3.7-inch HAA guns with No 10 Predictors and SCR-584 radar, and began using the proximity VT fuze with great success.Routledge, pp. 413–15.
