Locked Shields 2012 (LS12) was an international technical cyber defense exercise (CDX) conducted on 26-28 March 2012 with more than 250 participants in total. It was organized in cooperation with the Swiss Armed Forces (SAF) Command Support Organization, Finnish Defense Forces (FDF), NATO Cooperative Cyber Defense Centre of Excellence (NATO CCD COE), and the Estonian Cyber Defense League (ECDL).
Read more here – http://www.ccdcoe.org/355.html