The SG designations
An improvised escort force
The SG series combined ships of different origins and capabilities. Several were unfinished when captured, while others were converted from existing foreign vessels.

Captured escort
SG1
1942–1973
Captured escort
SG2
1942–1943
Captured escort
SG3
1942–1944
Captured escort
SG4
1943–1983SG10
Captured escort
SG10
1933–1943
Captured escort
SG11
1934–1944SG12
Captured escort
SG12
1944
Captured escort
SG13
1943–1944
Captured escort
SG14
1943
Captured escort
SG15
1943–1944
Captured escort
SG16
1944
Captured escort
SG17
1940–1944
Captured escort
SG18
1935–1944SG19
Captured escort
SG19
1935–1944
Captured escort
SG20
1922–1944
Captured escort
SG21
1944
Captured escort
SG22
1939–1944
Captured escort
SG23
1898–1947
Captured escort
SG24
1930–1944SG25
Captured escort