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Military Enigma machine Enigma Machine from World War II. Detail of Logo. An Enigma machine is any of a family of related electro-mechanical rotor cipher machines used for the encryption and decryption of secret messages.
The Battle of the Philippine Sea was the last occasion on which the Japanese Navy was able to challenge the US Pacific Fleet on equal terms. After the battle, the Japanese Navy had so few pilots and aircraft left that its aircraft carriers were virtually useless. Admiral Toyoda's plan was to trap the US carrier force between Vice-Admiral Ozawa's carrier force planes and land-based aircraft from Guam in Operation A-Go. The Japanese force consisted of the Mobile Force which was divided into Force A with Ozawa's three carriers the Taiho, Shokaku, and Zuikaku (which had 207 aircraft), Force B with another three carriers the Junyo, Hiyo, and Ryuho (which had 135 aircraft) and a Van Force of Vice-Admiral Kurita's battleships. Vice-Admiral Spruance's 5th Fleet assembled off the Marianas to protect the invasion force.
This German device consisted of a curved barrel attachment fitted to the MP-43 assault rifle which allowed it to shoot round corners. The device was requested in order to permit riflemen to shoot from cover without exposing themselves and also to allow the crew of a tank to fire downwards, close to the tank side, to prevent enemy infantry coming close enough to attach explosive charges to the tank Development was undertaken by the C. G. Haenel Company, and after extensive trials it was found that a simple extension would turn the bullet through 30 degrees, and deliver it accurately to the target up to a range of about 850m. The idea was first applied to the standard Gewehr 98 service rifle, it was then tried with the MG 34 machine gun, but since the deflection altered the recoil forces the machine gun would not fire at automatic.
The HK 4 pocket pistol was first introduced by Heckler & Koch in 1967 making it the first pistol produced by the company. Mass production of this pistol started in 1968 and continued until 1984. There were approximately thirty-eight thousand pistols produced during this time. Serial numbers 10001 to 36550 were for commercial distribution.