Ni Lin Aung was commander of Eastern Regional Military Command with the rank of Brigadier General from at least 15 January 2021 to at least 24 March 2022. While holding the rank of Major General commanding the Eastern Regional Military Command there was at least one alleged disappearance, killing, rape or torture committed by unit(s) under his command. He was then promoted in rank to Major General by at least 25 July 2022 and continued to command Eastern Regional Military Command with that rank until August 2022. He then was commander of Triangle Regional Military Command with the rank of Major General from at least 21 August 2022 to 20 July 2023. He was then promoted in rank to Lieutenant General and appointed commander of the Myanmar Police Force.