The Patriot missile system was not the spectacular success in the Persian Gulf War that the American public was led to believe. There is little evidence to prove that the Patriot hit more than a few Scud missiles launched by Iraq during the Gulf War, and there are some doubts about even these engagements. The public and the Congress were misled by definitive statements of success issued by administration and Raytheon representatives during and after the war. It is probable that many of the individuals giving such statements, including the President of the United States and Gen. H. Norman Schwarzkopf, were not aware at the time that the claims of success were false.
http://lambda.eu.org/special/gulf/extraits.htmlPostol Questions Success in Gulf War
It sounds more like fiction than fact: An inquisitive professor decides to investigate military claims that Patriot missiles successfully engaged 96 percent of the Iraqi Scud missiles hurled at Israel and Saudi Arabia during last year's war in the Persian Gulf, on a hunch that the figure was a gross overestimate.
After submitting his findings -- that at most one Scud out of 50 was destroyed by a Patriot -- for publication, the professor suddenly finds himself the subject of a Defense Investigative Service probe. The professor does not know when the investigation commenced or whether it is officially over.
"It was a Franz Kafka kind of situation," said Theodore Postol '67, a professor of science, technology, and national security policy. "The DIS never told me in writing that I was either under investigation or that the investigation was over or the nature of the claims against me. ... which is a very, shall we say, unorthodox way to do business."
http://wt.mit.edu/V112/N26/postol.26n.htmlMIT professor faults operation of Patriot missile
http://www.globalsecurity.org/org/news/2004/040430-patriot-faults.htm