On the day "Ro-105" was assigned to Submarine Squadron 7, she was detailed to Submarine Squadron 1 for service in the Aleutian Islands, where the Aleutian Islands campaign was in its final stages. The Battle of Attu of 11–30 May 1943 had ended in U.S. forces retaking Attu and annihilating its Japanese garrison, and on 21 May 1943 — even before the battle ended — Japanese Imperial General Headquarters had decided to evacuate the isolated Japanese garrison on Kiska. In operations with Submarine Squadron 1, "Ro-105" and her sister ship — which had been detailed to the squadron on 5 June 1943 — were to support the evacuation. "Ro-105" departed Kure on 16 June 1943 bound for Paramushiro in the Kurile Islands, which she reached on 21 June 1943.