Far be it from NASA to care that much (yet), but here it is:

The National Aeronautics and Space Act
Pub. L. No. 85-568 (as amended by Congress in 1984)

TITLE I

DECLARATION OF POLICY AND PURPOSE

Sec. 102.

"(c) The Congress declares that the general welfare of the United States requires that the National Aeronautics and Space Administration (as established by title II of this Act) seek and encourage, to the maximum extent possible, the fullest commercial use of space."

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For the entire Congressionally amended Act, feel free to visit the following:

http://www.hq.nasa.gov/ogc/spaceact.html

http://rk.gsfc.nasa.gov/richcontent/Reports/NASA_Reports/spaceact.html#POLICY
http://www.au.af.mil/au/awc/awcgate/amendact.htm