. . . "convoy CU 21" . "UC.1" . "oil runs" . "tanker convoys UC 1 and CU 1" . . . "CU" . . "UC" . "convoy UC 1" . "CU 3" . . "Convoy CU" . "CU convoys" . . "CU 1" . "CU 4" . . . "CU-21" . . "Convoy CU-36" . . "UC 1" . "CU convoys" . "United Kingdom" . "CU 17" . . "Convoy UC 1" . "UC 2" . "Convoy UC-1" . . "CU 2" . "UC 3A" . "UC 3" . "Cura\u00E7ao to the United Kingdom" . "UC 4" . .