Space pioneer Elon Musk hopes to put his name in the history books once again this week, with the planned launch and recovery of the first commercially operated spacecraft from orbit.

But to reach this point, his closely held company, Space Exploration Technologies Corp., already has managed to overcome regulatory hurdles never before encountered by the aerospace industry. And federal documents released on Friday underscore the bureaucratic complexities and huge technical risks confronting the pioneering effort

In June, SpaceX, as the company is known, launched its 18-story Falcon 9 rocket and successfully flew it for more than nine minutes. It was the first privately funded U.S. rocket launch in decades.

However, this week's scheduled mission to launch and return an unmanned, reusable Dragon capsule from low-earth orbit, anticipated to last for hours, poses many more challenges. Placing the vehicle into a such an orbit at speeds exceeding 17,000 miles per hour, then maneuvering through a fiery reentry and splashdown in the Pacific Ocean will require a flawless trajectory, a reliable heat shield and finally, perfect operation of the redundant parachutes, according to space experts.

Based on a ground test completed Saturday, SpaceX said blastoff could occur as early as Tuesday.