After 1988 he was appointed to the Operations and Training Branch Directorate Command, battalion commander in the 49th Infantry Regiment, program officer in the General Staff Financial Planning Program Department, and military representation and the chief of staff in the Western European Union, Brussels. He also served as head in the 108th Artillery Regiment Command for the Press, Public Relations and Publicity department and general secretary of the General Staff.
After Çolak was promoted to the rank of brigadier general in 2001, he served at the Appointment department and 19th Infantry Brigade Command of the Land Forces.[4] With his promotion to the rank of major general in 2005, he was appointed as the head of Personnel department, the General Secretary of the General Staff
and was promoted to the rank of Major General in 2005. In this rank, he served as the head of various branches of the Land Forces such as Personnel, the General Staff, the Armored Units School and the Training Division.
He was promoted to the rank of lieutenant general in 2009 and was subsequently appointed as commander of the 7th Corps and chief of staff in 2011.[4] Following by his promotion to the rank of four-stargeneral in 2013, he was transferred to the Training and Doctrine Command of the Land Forces.