name the astronauts and find the negative American
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regions.
The criteria for determining who has achieved human spaceflight vary. The Fédération Aéronautique Internationale (FAI) defines spaceflight as any flight above 100 kilometres (62 mi). In the 1960s, the United States Department of Defense awarded the rating of astronaut to military and civilian pilots who flew aircraft higher than 50 miles (80 km).[1] This list follows the FAI criterion.
From the Department of Defense, eight USAF and NASA pilots qualified for the Astronaut Badge by flying the sub-orbital X-15 rocket spaceplane.[1] One of these, Joseph A. Walker, flew the X-15 above 100 km on two flights, becoming the first person to enter space twice.[2][3][4] However, the other pilots did not reach the 100 km FAI limit. There are also five space travellers who surpassed the 50-mi-border on the sub-orbital SpaceShipTwo and are thus recognized as (commercial) astronauts by the FAA but not by the FAI since they didn't surpass the 100-km-line, while one of them had flown to space in the Space Shuttle already and thus already has been an FAI-recognized astronaut.