There are only a very few commodities for which U.S. purchase is required. Precision ball bearings is one example. In addition, gov't contractors must certify that they will use U.S. flagged ships if necessary to transport goods by sea.
FYI - anyone can get procurement decisions, sole source justifications, etc., under a FOIA request. Such a request in this instance should show exactly what happened.
I understand. My point is that our policy should change.