Mamun Khaled was a signal corps officer of Bangladesh Army from the 5th BMA long course. He served as the director of the Directorate General of Forces Intelligence (DGFI) from December 2007 to December 2010 and as the director general of the same organization from 23 June 2011, to 7 March 2013.[7][8]
He was then made the vice-chancellor of the army-run Bangladesh University of Professionals.[2] He was the first person to complete PhD in Bangladesh University of Professionals and earned the Chancellor Gold Medal.[3][9]
Khaled served in a number of different positions in Bangladesh Army. He was an instructor at Military Intelligence School, Army Headquarters, colonel staff of an Infantry Division, commandant of the School of Military Intelligence, area commander logistic area. Prior to assuming as the commandant, National Defence College of Bangladesh, he was also commandant of Bangladesh Ordnance Factories.[10]
The general also served in the UN Protection Force (UNPROFOR) in Bosnia and UN Mission in Sierra Leone (UNAMSIL).
The Bangladesh Rifles (BDR) mutiny in February 2009 resulted in significant loss of life, including 57 army officers. At that time, Khaled in the rank of Lieutenant General, was serving in the Directorate General of Forces Intelligence (DGFI). In a 2024 interview, he discussed the events surrounding the mutiny, indicating that despite being on the ground during the crisis, decisive action was delayed, leading to increased casualties. He suggested that prompt military intervention could have mitigated the damage.[11]
In March 2026, Khaled was detained by the Detective Branch of Bangladesh Police in a murder case filed over the death of a protester against Sheikh Hasina in July 2024.[12] Around the same time, two other former officers of DGFI were detained, Lieutenant General Masud Uddin Chowdhury and Lieutenant Colonel Md. Afzal Naser.[13]