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The National Interest on MSN13 天
The X-15 was a Starfighter in All But Name
The X-15 was a key bridge between conventional atmospheric flight and spaceflight. The North American X-15 is one of the most ...
来自MSN2 个月
The U.S. Air Force Went to Space on the North American X-15
The X-15 is the only conventional aircraft that has ever been flown ... a test flight aboard the North American X-15. Before ever commanding a Gemini or Apollo mission, Armstrong was a test ...