Born to an Assyrian father, Adam Benjamin and Armenian mother, Margaret Marjanian, in Gary, Indiana, on August 6, 1935, Adam Benjamin Jr. graduated from Kemper Military School in Boonville, Missouri, in 1952. Benjamin joined the Marine Corps in 1952, and served as a Corporal in the Korean War until he was honorably discharged in 1954. After serving in the Marine Corps, he gained an appointment to the United States Military Academy, West Point, New York, earning a B.S. degree in engineering in 1958. Following three years in the 101st airborne division the "Screaming Eagles", and ranger training in the U.S. Army, in 1961 Benjamin left the Army as a First lieutenant.