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一架准备参加第22届“路易斯维尔航空展”的退役 SB2C-5“地狱俯冲者”轰炸机在美国肯塔基州空中国民警卫队基地。（A retired F4U Corsair fires up its engine on the Kentucky Air National Guard tarmac prior to practicing for the Thunder Over Louisville on April 20, 2012, in Louisville, Ky. A special segment of the six-hour Thunder Over Louisville air show on April 21 will highlight Marine Corps aircraft in recognition of the Corps' 100th year of flying operations. The United States Marine Corps began its aviation program on May 22, 1912.）