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      Beginning in the mid-1980s, the U.S. Air Force 
	  and NASA have supported a number of studies of aircraft that are 
	  consistent with accounts of the ¡§Aurora¡¨ reconnaissance aircraft project, 
	  the proposed successor to the SR-71 Blackbird which would retired in 1999. 
	  While various sources disclosed that Lockheed¡¦s secret Skunk Works was 
	  developing a SR-75 Penetrator for the U.S. Air Force, Aviation Week and 
	  Space Technology magazine first reported the news that the term "Aurora" 
	  was inadvertently released in the 1985 US budget, as an allocation of $455 
	  Million for aircraft construction in fiscal year 1987. As the role of the 
	  SR-71 Blackbird, it was believed that the SR-75 was designed as a 
	  reconnaissance drone mother-ship. In 1995, U.S. congress approved $100 
	  million to bring the SR-71's back into service. One argument is that the 
	  SR-75 Penatrator project was abandoned, either due to expense or technical 
	  difficulties, and that the SR-71 had to be brought back to resume its 
	  mobile surveillance role.    |