The Leonidas Squadron, formally known as 5th Staffel of Kampfgeschwader 200 was a unit which was originally formed to fly the Fieseler Fi 103R (Reichenberg), a manned version of the V-1 flying bomb, in attacks in which the pilot was likely to be killed, or at best to parachute down at the attack site. The Reichenberg was never used in combat because Werner Baumbach, the commander of KG 200, and his superiors considered it an unnecessary waste of life and resources, and preferred instead to use the Mistel bomb, piloted from a regular Luftwaffe single-seat fighter used as an integral parasite aircraft, as the only manned part of the composite aircraft Mistel ordnance system, which released the lower, unmanned flying bomb component aircraft towards its target and returned.
The establishment of a suicide squadron (staffel) was originally proposed by Otto Skorzeny and Hajo Herrmann. The proposal was supported by noted test pilot Hanna Reitsch. The idea proposed was that Germany would use volunteers as suicide pilots in order to overcome the Allies' numerical advantages with their fanatic spirit. The idea had roots in German mythology that was glorified by Nazi propaganda. Hitler was reluctant, but eventually agreed to Reitsch's request to establish and train a suicide attack air unit, with the proviso that it would not be operated in combat without his approval. The new unit, nicknamed the "Leonidas Squadron", became part of KG 200. It was named after Leonidas I, the king of Sparta who in 480 BC resisted the invading Persian army at the Battle of Thermopylae with 300 elite warriors who fought to the last man.
Reitsch's plan was to attack Allied invasion shipping using the Messerschmitt Me 328 as a suicide weapon which would dive into the sea underneath ships and explode a 900 kilograms (2,000 lb) bomb. Heinrich Himmler approved the idea, and suggested using convicted criminals as pilots. The Luftwaffe's High Command was unenthusiastic; Erhard Milch turned the plan down as impractical, and Hermann Göring showed little interest. Adolf Hitler was against the idea of self-sacrifice, believing that it was not in keeping with the German character, and furthermore did not see the war situation as being bad enough to require such extreme measures. Despite this, he allowed Reitsch to proceed with the project after she had shown the plan to him in February 1944. Günther Korten, the Luftwaffe's head of general staff, gave the matter to the commander of KG 200 to deal with.