Active Duty Registration has officially begun for the Marine Corps Marathon.

The special discount and early registration applies to all active duty and reserve service members. Military personnel from all branches of the armed forces will receive a 15 percent discount off the regular $92 entrance fee.

Military personnel have until March 6 to take advantage of the discount. Registration opens to the general public on March 7.

The Marine Corps Marathon, which takes place on October 28, is the fourth largest marathon in the United States and the ninth largest in the world. The race starts and ends in Arlington.