Mahamat Déby Itno first enrolled at the Joint Grouping of military schools in Chad. He subsequently received training in France, at the military school of Aix-en-Provence. Upon his return he was enrolled in second promotion of semi direct of the school of officer inter arme and latter was appointed to the service branch for the Security of State Institutions (SERS), as a deputy commander of the groupement of infenterie. His first combat experience took place in in April 2006 when rebel attacked the capital city of Chad and later participated in a combat in eastern Chad along with General Abakar kirekenyo, then director of gendarmery, Mahamat was given the rank of major afterward. he led forces when he took part in the command of Chadian forces during the Battle of Am Dam, where his army defeated the rebels in an unprecedented victory.
Following his victory, he was appointed command of the armored squadrons and bodyguards of the SERS. In January 2013, he was appointed second in command of the Chadian special forces in Mali under general Oumar Bikimo. On 22 February, he led his army against rebels in the Adrar des Ifoghas mountains in Northern Mali leading to the Battle of Ifoghas. They eliminated a rebel base said to be of "significant importance", inflicting heavy losses upon the rebels but also losing twenty-six men in the process, including Abdel Aziz Hassane Adam, a commander of special forces. mahamad took full command of the FATIM and has since been leading operations against rebels in the North.