On 8 September, "Signet" headed for Japan and, the next morning, began sweeping the approaches to Sasebo. For two months, she swept the area around Sasebo during the day and anchored at Matsu Shima, Kyūshū, at night. From late September until early October, her crew enjoyed liberty in Sasebo. From 11 to 21 October, "Signet" swept the area around Iki Island and Tsushima Island off the northwestern coast of Kyūshū. Between 26 October and 10 November, "Signet" conducted operations in the East China Sea southwest of Kyūshū. On her final sweep, 17 November to 5 December, "Signet" returned to the vicinity of Tsushima.