SETAF's mission and geographical area of responsibility increased in 1972 when the command enlarged its signal support unit and took control of the 558th U.S. Army Artillery Group (USAAG) in Greece and the 528th USAAG in Turkey. These units had been in support of NATO since the early 1960s, along with the 559th USAAG, which had been a USASETAF unit in Italy since 1964. The 509th Infantry Regiment (Airborne Battalion Combat Team - ABCT) was previously placed under the command of SETAF in 1973 and later inactivated in the mid-1980s; it was replaced by the 4th Battalion, 325th Infantry Regiment. The 4/325th ABCT was composed of three line companies (including a COHORT company) Alpha, a headquarters company, a combat-support company, and a 105mm artillery battery. A member of NATO's Allied Mobile Forces (Land), the 4/325th ABCT was the right flank element of the European front during the late Cold War and was deployable by parachute to anywhere in the region.