[3] The operation consisted of troops from the East African nations of Ethiopia, Kenya, Burundi, Djibouti, and Uganda.

[4] ATMIS transitioned into the AU Support and Stabilization Mission in Somalia (AUSSOM) at the start of 2025.

[7] The African Union Transition Mission in Somalia was formed on 1 April 2022, following the end of the AMISOM mandate on 31 March.

The mission is focused on both military and institutional autonomy of the Somali government as the African Union pulls out.

[10][11] On 6 April 2022, the Prime Minister of Somalia Mohamed Hussein Roble orders African Union Ambassador to Somalia Francisco Madeira persona non grata to leave the country within 48 hours because of "engaging in acts that are incompatible with his status," after audio emerged of him criticizing government officials for not dealing with national security problems.