Link , Link , Link , Link , Link , Link , Link , [In his Oklahoma City oral history, Garland said he learned an important lesson about the new world of terrorism that the U.S. was then entering. "We made it up as we were going along, and it was clear when that was over that we couldn't do that again," he said. "We had to have a system." When Garland got back to Washington, D.C., the Justice Department began in earnest to develop that system. It's a system that has been continually perfected and used since then, for everything from mass shootings to 9/11.]