They used their technology wrong. Jet engines? Build a bomber! Rockets? Instead of using the "Waterfall", a design on which all post-WW2 anti Aircraft missile

They used their technology wrong. Jet engines? Build a bomber! Rockets? Instead of using the "Waterfall", a design on which all post-WW2 anti Aircraft missiles were based on to bring down enemy airplanes and bombers, they build the V2.