The Pentagon has approved an increase in cyber security staff that would see an increase in the number of staff from around 900 to roughly 4,900. The 4,900 staff members would be composed of both military and civilian personnel and is possibly in response to events such as Anonymous' attack on the US DOJ or the finding of malware on power plants' computers.
Future wars are likely to be conducted in cyber space rather than on the ground with traditional troops and weapons, so it will be important for the US to have a large enough security force that is well trained to protect itself from these future threats. Defense Secretary Leon Panetta acknowledges that the US hasn't invested enough in cyber security:
"We've got good people that are involved in it, but, very frankly, if we're going to stay on the cutting edge of what's happening with regards to the chances that are occurring, we have to invest more in that area," Panetta said in a speech last November.