The US currently has two X-37 OTV shuttle drones. A third was recently approved. Design for this began in1999, more than 10 years prior to retiring the shuttle. Much was learned from the original shuttle program.
http://en.wikipedia.org/wiki/Boeing_X-37 On Saturday, May 26, 2012, Terry Blanton wrote: > Contact with Jodie Foster: > > S.R. Hadden: First rule in government spending: why build one when you > can have two at twice the price? > > T > >

