Timor, Yudhoyono became a mortar platoon commander in 1977, an operations officer for an airborne brigade from 1977 to 1978, and a company commander at Kostrad from 1979 to 1981. Yudhoyono then spent 1981 and 1982 working at the Army headquarters. While working at the Army headquarters, Yudhoyono was sent to the United States again, this time to participate in the Infantry Officer Advanced Course at Fort Benning and in training with the 82nd Airborne Division. Yudhoyono also spent time in Panama and went through the jungle warfare school. When Yudhoyono returned in 1983, he was made commander of the Infantry Trainers' School. It was not long before he was abroad again, this time to Belgium and West Germany, to undertake the Antitank weapons Course. In 1985, Yudhoyono also took a Battalion Commando Course in Malaysia. From 1986 to 1988, Yudhoyono served with Kodam IX/Udayana, which covers Bali and the Lesser Sunda Islands. Yudhoyono was a battalion commander from 1986 to 1988 and was part of the operational staff in 1988. In 1989, Yudhoyono became a lecturer at the Army Staff College (Seskoad) and delivered a presentation entitled "ABRI's Professionalism at the Present and in the Future". Together with Agus Wirahadikusumah, Yudhoyono published a book entitled "The Challenges of Development". Whilst at Seskoad, Yudhoyono also took the opportunity to further his own military education. He went to the US Army Command and General Staff College at Fort Leavenworth, Kansas. While in the United States, he took the opportunity to obtain an MA degree in business management from Webster University in 1991. In 1992, Yudhoyono was transferred to the Army Information Department and worked as a speechwriter for General Edi Sudrajat, the Army chief of staff. In 1993, when Edi became commander of the Military of Indonesia (ABRI), Yudhoyono joined Edi's personal staff. Edi did not last long as ABRI commander and Yudhoyono was then transferred back to Kostrad where he became a brigade commander. A year later, Yudhoyono was the operations assistant at Jaya (Jakarta) Military Area Command before taking command IV/Diponegoro Military Area Command in Central Java. Yudhoyono had one more stint overseas when he became Indonesia's chief military observer of the United Nation Peacekeeping Force in Bosnia in 1995–96. When Yudhoyono returned to Indonesia, he was made KODAM Jaya chief of staff before being appointed as KODAM II/Sriwijaya commander. In this position, Yudhoyono was responsible for military operations