The United States will leverage IT know-how among members of the National Guard and the nation’s military reserves by increasing the number of units that have dedicated cybermissions, U.S. Deputy Defense Secretary William Lynn announced Tuesday. Government efforts alone can’t fend off cyberattackers, and stronger cooperation with the private sector is crucial, said Lynn, who was speaking at the RSA 2011 security conference in San Francisco. To that end, the Department of Defense is strengthening ties with the private sector.