Name/Hull Nbr                                         Class                                        Conversion Yard/Year

USS Entemedor (SS340)

USS Diodon  (SS349)

USS Hardhead (SS365)

USS Jallao (SS368)

USS Menhaden (SS377)

USS Picuda (SS382)

USS Bang (SS385)

USS Pomfret (SS391)

USS Razorback (SS394

USS Ronquil (SS396)

USS Sea Fox (SS402)

USS Threadfin (SS410)

USS Stickleback (SS415)

USS Thornback (SS418)

USS Trante (SS420)

USS Trutta (SS421)

USS Quillback (SS424)

USS Pomodon (SS486)

Balao

Balao

Balao

Balao

Balao

Balao

Balao

Balao

Balao

Balao

Balao

Balao

Balao

Tench

Tench

Tench

Tench

Tench

Electric Boat - 1952

From Guppy II

Electric Boat - 1953

Mare Island - 1954

Mare Island - 1953

Portsmouth - 1953

Portsmouth - 1952

Mare Island - 1953

Portsmouth - 1954

Mare Island - 1953

Mare Island - 1953

Portsmouth - 1953

Mare Island - 1953

Charleston - 1953

Portsmouth - 1953

Charleston - 1953

Portsmouth - 1953

Hunter's Point 

    Much like the Guppy II, the IIA streamlined the boat, installed a new sail, a guppy bow, and new motors where necessary.  One of the forward engines was removed.  In this space, air conditioning plants and refrigeration units were installed.  Some boats had the high pressure air compressors relocated to the lower level of the forward engine room.  The chill box and freeze boxes were moved to the forward end of the after battery under the galley.  Sonar was moved to the space now available in the forward end of the pump room.  The Guppy IIA had the same outward appearance as the Guppy II, except the IIA had only three diesel exhaust outlets and the II had four.