Security Status and Countermeasures of the U.S. Military in Cyberspace

My research paper will be focusing on the level of importance and effort on behalf of the U.S. Military to investigate, prevent, and pursue security threats in cyberspace. Cyberspace is loaded with sensitive information, our credit card numbers, social security numbers, addresses, emails, you name it, its probably there. However, to what extent does the U.S. go? Are there any examples or circumstances where the military has intervened? Well, hopefully, this research will be able to tell you!