One effort in the direction of space transportation was the Reusable Launch Vehicle (RLV) program, initiated in 1994 by NASA. This led to work on the X-33 and X-34 vehicles. NASA spent about US$1 billion on developing the X-33 hoping for it be in operation by 2005. Another program around the turn of the millennium was the Space Launch Initiative, which was a next generation launch initiative.
One effort in the direction of space transportation was the Reusable Launch Vehicle (RLV) program initiated in 1994 by NASA This led to work on the X-33 and X-34 vehicles NASA spent about US$1 billion on developing the X-33 hoping for it be in operation by 2005 Another program around the turn of the millennium was the Space Launch Initiative which was a next generation launch initiative