Night fighter
Night fighter operations did form part of Wehrmacht war games during 1935 and 1936. Luftwaffe Service Regulation No. 16 mentioned night fighting only in Section 253. The regulation stipulated in vague language, that night fighting zones should be established so that night fighters and anti-aircraft artillery did not interfere with each other's operations. The regulation foresaw the use of Search lights in cooperation with pilots. Any hindrance to offensive air forces caused by "restrictive measures" was to be avoided. The prevailing attitude to night fighting left commanders on the ground to carry out research on their own; the first occurred in Berlin, by "Luftkreiskommando" II from May to November 1936. The "Oberkommando der Luftwaffe" did order experiments with searchlights and aircraft from the summer, 1937. In 1939 several night fighter "staffeln" (squadrons or flights) had been established; but all of these had been converted back to day fighter units by 16 August 1939.