Hackers and hostile nations are launching increasingly sophisticated cyber attacks against U.S. defense contractors.The Pentagon is extending a program to help protect its prime suppliers, while serving as a possible model for other government agencies. Analysts are investigating a growing number of cases involving the mishandling or removal of classified data from military and corporate systems. Defense officials say intrusions into defense networks are now close to 30 percent of the Pentagon's Cyber Crime Center's workload. -Photos by AP