'91 Cyber Brigade 2 (U.S. Army)' The '91 Cyber Brigade 2', also known as the U.S. Army Cyber Command's 91st Cyberspace Operations Group, is a specialized unit within the United States military dedicated to cyber warfare and digital security operations. This group falls under the broader U.S. Army Cyber Command, which was established in 2010 as part of the U.S. Army Forces Command. The primary role of the 91st Cyberspace Operations Group is to defend U.S. interests in cyberspace by conducting offensive and defensive cyber operations, as well as electronic warfare. Their activities include network exploitation, electronic attack, computer network defense, and information warfare support. The unit operates from Fort Buchanan, Puerto Rico. The '91 Cyber Brigade 2' is one of the key components ensuring the U.S. Army's readiness to counter cyber threats both domestically and internationally.