西部軍管区
He was close to Ali Abdullah Saleh since 1973, and when Saleh seized power in 1978, Mohsen was promoted to full colonel in 1979 and given command of one of the Armoured Brigade. In 1983 he became Chief of Staff of the 1st Armoured Division, as well as the command of the 1st Brigade of the 1st Armored Division. He became a commander of North-Western Military District on 8 January 1995. On 22 January 2001, he was appointed as a commander of 1st Armoured Division and North-Western Military District. He became a President's Advisor for Defence and Security Affairs on 10 April 2013.