Topping his class in PMA, Ileto gained his appointment to the United States Military Academy in West Point, through the Foreign Cadet Program.

[1] In New Guinea, Lt. Ileto transferred to the famed Alamo Scouts of the Sixth United States Army.

With the Alamo Scouts, Ileto saw action in southern Samar during the Battle of Leyte, and thereafter in the Invasion of Lingayen Gulf on January 9, 1945.

[1] On January 30, 1945, Lt. Ileto with the Alamo Scouts under the command of Lt. Col. Henry Mucci, successfully rescued 516 prisoners of war held by the Imperial Japanese Army's POW Camp in Cabanatuan, Nueva Ecija.

[5] This has become to date the most successful rescue mission of the United States Army, and is known as the Raid at Cabanatuan.

Both officers came with the idea to constitute a special forces unit in the same fashion as that of the Alamo Scouts.

Thereafter, he became Commanding General of the 1st PhilippineC Zone, covering all provinces north of Manila before being promoted to Deputy Chief of Staff for Intelligence (J-2) in 1969.

[1] Col. Ileto once more returned to the United States to study under the Defense Resources Management Course at the University of Pittsburgh, Pennsylvania in 1969.

[7] Concurrent to this position, Gen. Ileto also served as the Philippine Ambassador to Iran and Turkey from 1975 to 1980, and to Thailand, Cambodia, and Laos from 1980 to 1986.

[2] He was buried at the Libingan ng mga Bayani on June 23 with full military honors.