In 2001 , the September 11 attacks resulted in the destruction of the World Trade Center complex , also in Manhattan . The attacks led to increased security in transit hubs across the city , including in Grand Central . Since 2001 , the Joint Task Force Empire Shield ( personnel from the New York National Guard ) has maintained a constant presence in the terminal . Also shortly after the attacks , the MTA ordered two American flags to be hung in the terminal 's Main Concourse , including a 20 x 40 ft. flag hung in the center of the room , suspended from the ceiling
September 11 attacks
September 11 attacks
History of Grand Central Terminal