Aye Ko was posted to South Western Regional Military Command as colonel general staff officer (G1) on 9 September 1964.

[citation needed] On 2 June 1966, Aye Ko was transferred to Military Operations Department at the Ministry of Defence as colonel general staff officer (G1).

[citation needed] Aye Ko was posted to 88th Light Infantry Division on 24 April 1967.

[citation needed] He was promoted to the rank of brigadier general on 2 April 1976 and became Vice Chief of Staff (ARMY).

[citation needed] Aye Ko resigned honorably from Myanmar armed forces on 19 September 1981.