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The Fieseler Fi-103, also known as V1 or buzz bomb, was one of the first cruise missile in history. The name comes from the German Vergeltungswaffe 1, or vengeance weapon n.1, as the German propaganda called it. It was powered by a pulse jet, the only production aircraft to use it; being unmanned it had may reliability issues at the start but these were figured out during the war. The weapon was deployed for just around a year, between June 1944 and March 1945; their target was London and were fired from stationary launch sites with concrete rails roughly aimed at Southern England, although due to their limited range once these sites were overrun in France and Western Germany they couldn't reach their intended target anymore and the launches were stopped. Unlike the V2 rocket, which was used as a basis for the rocket program to reach the moon, the V1s proved to be a dead end as a concept, although the reasoning behind it gave birth to the modern cruise missile (unguided).