The Fletcher class is america's most famous destroyer in World War II, which formed the backbone of the U.S. Navy destroyer fleet in the latter part of World War II. A total of 175 Fletcher classes were built in just two years and took part in various important air campaigns in the latter stages of the war. Battleship manual: 1 key to activate anti-aircraft guns, 2 keys to activate the main gun set. 3 key activates the vertical take-off and landing system. The engine accelerates the system after 4 keys are activated. 5 keys to open the torpedo compartment. 6 key activation torpedo turning device (not recommended) author's words: This is my second air-to-air warship, her production is very difficult, please give a up thank you