WASHINGTON, Sept. 6, 2006 – For the man who now serves as the senior enlisted advisor to the chairman of the Joint Chiefs of Staff, watching the televised image of an airliner hitting the World Trade Center signaled the end of an era as the country was thrust into war. Army Command Sgt. Maj. William J. Gainey, then regimental sergeant major for the 2nd Armored Cavalry Regiment at Fort Polk, La., said he remembers returning home after an early morning run Sept. 11, 2001, and flipping on the TV news as he cooled down. Gainey was transfixed by shots of...