Ōminato Guard District
From mid-December to April 1942, "Oboro" was based at Kwajalein, and from mid-April to the end of August 1942, "Oboro" was based at Yokosuka, patrolling in the nearby waters, and escorting convoys from Yokosuka to Ōminato Guard District to the north, and Mako Guard District to the southwest.