“Red Teams” are the bad guys in these sorts of activities; they provide live, active challenges to the competitors. The people on these teams include cyber professionals from the military (like my husband), the NSA and private sectors (including Raphael Mudge, creator of Armitage and Cobalt Strike and a great activist for the future of cyber warfare).
From the CCDC site:
You have just been hired as the network and security administrators at a small company and will be taking administrative control of all information systems. You know very little about the network, what security level has been maintained, or what software has been installed. You have a limited time frame to familiarize yourself with the network and systems and to begin the security updates and patches before the red team starts actively attacking your company. In the midst of all the commotion, you have to keep up with the needs of the business and user demands while maintaining service level agreements for all critical Internet services. Welcome to the first day of the National Collegiate Cyber Defense Competition (CCDC).
There are competitions held all over the country culminating with the national finals in San Antonio in April. They are looking for volunteers; if interested, you can find more information here.