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Airport and border securities were tightened, and many Americans turned to private security firms to ensure their own personal safety. Millions of businesses also turned to private security to shore up their business defenses. Studies indicate that some forms of private security services are booming, but overall, the security industry has actually declined between 1999 and 2004. The nation's private security industry has certainly changed since the September 11 terrorist attacks, but how much it has changed really depends on specific areas of security. One industry researcher notes, "In 2003, there were approximately one million security guards including airport screeners employed in the United States compared to 650,000 U. S.