http://wired.com/news/politics/0,1283,62052,00.html?tw=wn_tophead_2
Y-12 is America's main facility for processing enriched uranium. It stores nearly all of the country's reserve of about 5,000 “secondaries,” the thermonuclear hearts of hydrogen bombs.
When a team of Y-12 rent-a-cops racked up a perfect score during an antiterror drill June 26, officials there were shocked. How could the guards have performed so well, they wondered, when a computer model had predicted that the defenders would lose at least half of their confrontations?
The answer was simple: The guards cheated. They had seen the computer models of the strikes the day before they were launched, rendering the test “tainted and unreliable,” according to the report.