Contractors working under the Huntsville Center covered more than 40 million square feet nationwide and logged nearly 10,000 devices for the Army Reserve alone. Why Are Building Systems Now a Cybersecurity Concern? Building systems are now a cybersecurity concern because operational technology encompasses the equipment that operates and monitors facilities. The Army Reserve data gives commanders and facility managers a risk register and a replacement road map covering the next five to 20 years. Ron Brook, chief of the center’s operational technology branch, said the point is to give leaders what they need to make investment decisions, rather than simply documenting equipment.