Wolfpacks U-731 was part of
U-731 operated with the following Wolfpacks during its career:
Iller (12 May 1943 - 15 May 1943)
Donau 1 (15 May 1943 - 26 May 1943)
Leuthen (15 Sep 1943 - 24 Sep 1943)
Rossbach (24 Sep 1943 - 9 Oct 1943)
Rügen 7 (28 Dec 1943 - 2 Jan 1944)
Rügen 6 (2 Jan 1944 - 7 Jan 1944)
Rügen (7 Jan 1944 - 26 Jan 1944)
Stürmer (26 Jan 1944 - 3 Feb 1944)
Igel 2 (3 Feb 1944 - 16 Feb 1944)