Col. Robert Marr Jr. was in charge of air defenses during the Sept. 11 terrorist attacks. (Photo by Dick Blume) Commander of 9/11 Air Defenses Retires BY ROBERT A. BAKER ROME, N.Y. -- On Sept. 10, 2001, Col. Robert Marr Jr.'s mission at Griffiss Air Force Base appeared to be on the wane. The Cold War threat his National Guard unit was designed to keep in check had all but disappeared. Twenty-four hours later, Marr found himself in the center of another war. His command, the Northeast Air Defense Sector, coordinated the military's air response to the terrorist...