The head of the US Marines wants to recruit about 3,000 troops skilled in online warfare and espionage to make sure the Corps is ready for 21st-century battle . . If the army can't swell its computer security teams from its own ranks, it will have to tap up civilians. Getting good hackers and security folks for the armed forces isn't easy, though. In hacking competitions, civvies regularly clean the clocks of full-time military counterparts – and convincing them to sign up for military life in the Marine Corps could be a very tough sell indeed.