How much damage has Chinese hacking done to the US government?

Tuesday - 5/20/2014, 5:47pm EDT

A government report indicates more than 40 Pentagon weapons programs and nearly 30 other defense technologies have been compromised by cyber intrusions from China. The cybersecurity firm Mandiant issued a report last year alleging links between a secret Chinese military unit and years of cyber-attacks against U.S. companies. Alcoa World Alumina, Westinghouse Electric Co., Allegheny Technologies, U.S. Steel Corp., the United Steelworkers Union and Solar-World are just six companies the Justice Department says were victims of Chinese hacking. U.S. officials suggest there are many more amounting to billions of dollars in economic losses.