Thanks for such thorough investigation. Are you sure of what you are saying?
I have no reason to doubt the authenticity of "USS Long Island", as shown in NavSource Online. There are few dozens photos of her taken during the period 1941-1944 as a military vessel and few taken later during her commercial service after the war. They are all well documented and dated. I have also no doubt that the pictures from the Wesołowski's web page and one of the pictures of "USS Long Island" are exactly the same - not just similar, maybe taken from different angle, or with different cargo; no, they are exactly the same. So what would be your conclusion?
It would be inconceivable that Wesołowski the Senior would ever mistake the picture of "USS Long Island" by his beloved "USAT Ganandoc". So if he passed this picture to his son as "USAT Ganandoc" than he lied. But if this was a handiwork of Wesołowski the Junior - for whatever reason, such as embellishment - than the Junior lied. In either case this does not look good.
Do you suggest, judging by that vessel identity theft, that the whole heroic story of Wesołowski is fake?
I really do not know. The story may be a mixture of truth and falsity. I have many doubts, but I am by no means a self appointed champion of the Wesołowski case.
I have done some more research on Wesołowski and Ganandoc.
Wesołowski's original story, and the direct and indirect variations on the theme, describe the vessel Ganandoc variously as USAT Ganandoc or USS Ganadoc - an auxiliary aircraft carrier, carrying aircraft and supplies "through Halifax in Nova Scotia, across the Atlantic to Liverpool, England and serving as part of protective convoy against enemy aircraft and submarines." ... "After extremely lucky years on the Atlantic and Murmansk patrols the Ganandoc was assigned to duty with the invading flotilla assembled for the invasion of Normandy."
The Ganandoc is mentioned in the Larson's monograph (see below) not as an "auxiliary aircraft carrier" but as a "flat top shuttle ship" - a coastal ferry transporting small number of aircraft from crude oil terminals - where tankers or freighters had been bringing them across the Atlantic - to their final debarkation harbours. Larson states that Ganandoc and two other such small vessels were bareboat chartered, so it is very likely that the Ganandoc had been chartered by US from the Government of Canada and the two of them (a Canadian and an American ships) are actually the same vessel.
So, even though it is quite probably for Stefan P. Wesołowski to command a flat top shuttle ship in civilian capacity, it appears that he was never in command of an American aircraft carrier (auxiliary or not), and calling him a Hero of two nations
(memoriesofwar.com/veterans/wesolowski/default.asp) is certainly a big exaggeration. As I said before - embellishments and adornments are there for no good reasons.
As for Ganandoc combating aircraft and submarines during convoy duties across Atlantic and to Murmansk - this seems to me as a sheer imagination of Mr. Wesołowski.The Army's Cargo Fleet in World War II
The following are the excerpts from:
The Army's Cargo Fleet in World War II, 283/2, Monograph #18, prepared by Mr. Harold Larson, Office of the Chief of Transportation, Army Service Forces, May 1945,
While in the past most airplanes shipped overseas have been carried on tanker decks, ZEC-2 and ZEC-5  vessels carry increasingly large numbers of aircraft both in the Atlantic and in the Pacific.
However, mention should also be made of three small ships in coastal service for the Transportation Corps in the United Kingdom
. These are the so-called flat top shuttle ships
. They have a flat wooden deck, built above the main deck, upon which airplanes are stowed.
These craft transport newly arrived airplanes to various processing points that may be as far distant as 100 miles from the port of debarkation, thus facilitating prompt unloading of vessels on the spot, and making unnecessary the movement of the airplanes by truck. These aircraft shuttle ships, all operated on bareboat charter
, are the JULIUS H. BARNES, the GANANDOC
, and the SORELDOG [1a]. See the page 106-107.
 The SORELDOG was recently lost through enemy action. On these aircraft shuttle ships compare the remarks of Col. R. M. Hicks, ChiefS Water Division, OCT, in the processed proceedings of the Port and Zone Conference at Chicago, Illinois, 6-9 July 1944, p. 7.
[1a] SORELDOG or SORELDOC? If chartered from Dominion of Canada then the latter name is more probable.
 Bareboat charter: A bareboat charter is an arrangement for the chartering or hiring of a ship or boat, whereby no crew or provisions are included as part of the agreement; instead, the people who rent the vessel from the owner are responsible for taking care of such things.
In a bareboat charter no administration or technical maintenance is included as part of the agreement. The charterer obtains possession and full control of the vessel along with the legal and financial responsibility for it. The charterer pays for all operating expenses, including fuel, crew, port expenses and P&I and hull insurance. [Wikipedia]
 ZEC-2 and ZEC-5 vessels :
ZEC-2 type freighters, which have specially altered as aircraft cargo carriers
ZEC-5 - specially designed aircraft cargo ships for use in Pacific, first delivered in early 1945Patterson's vessels with names ending in "doc" - Dominion of Canada
Between the years of 1927 and 1929 Swan Hunter was building 6 single-screw steamers for "Paterson Steamships Limited" of Fort William, Ontario, Canada. Those ships were named:
Lachinedoc - built 1927
Novadoc - built 1928
Sarniadoc - built 1929Ganandoc
- built 1929
Farrandoc - built 1929
Mandoc - built 1928
All their ships were named for Ontario cities, shortened of course, followed by doc
for Dominion of Canada
. The only city that comes to mind is Gananoque, Ontario which is on the St Lawreence River near Kingston.
Engine Builder Swan Hunter
D 17.9 '
Gross tons 1924JOURNALS OF THE SENATE OF CANADA
JOURNALS OF THE SENATE OF CANADA, FIFTH SESSION OF THE NINETEENTH PARLIAMENT, 8-9 GEORGE VI, A.D. 1944-45, VOLUME LXXXIV, OTTAWA,
210. Return showing:
1. Under whose name the following vessels were registered in August, 1939, and on August 31, 1940, 1941, 1942, 1943, respectively, named Bricoldoc, Canadoc, Cartierdoc, Collinadoc, Coteaudoc, Farrandoc, Fort Wildoc, Ganandoc
, Hamildoc, Kenordoc,
Kingdoc, Lachinedoc, Lavaldoc, Law-renoedoc, Mantadoc, Mondoc, Neivbrundoc, Novadoc, Ontadoc, Portadoc, Prescodoc,Prindoc, Qwdoc, Sarniadoc, Saskadoc, Soodoc, Soreldoc
, Thordoc, Torondoc, Troisdoc, Vandoc, Welkmdoc [Id numbers elided for simplicity - Boletus].
2. Which of the said vessels, if any, were requisitioned (a) for use by the
Government of Canada, or any Board or Crown company under authority of
the Government of Canada; what compensation was paid and to whom, for
same, per diem, per month or otherwise; (b) by the Canadian Shipping Board
acting as agents for other than Canadian authorities?
3. Which of the said vessels were purchased by the Government of Canada,
and what amounts were paid or contracted to be paid for each vessel, showing
date of purchase or acquisition, and date or terms of payment, and under what
act or statute the said vessels were requisitioned or purchased?
210a. Return showing:
1. Having reference to the acquisition of the following six ships from the
Patterson Steamship Company, viz., Coteaudoc, Farrandoc, Ganandoc
, and the Wellandoc, how was the valuation arrived at?
2. Was it by arbitration? If so, who was the arbitrator?
3. If by direct negotiations, who acted, (a) for the Patterson Steamship
Company; (b) for the government of Canada?
4. Having reference to Return No. 210, were the following seven Canadian
ships, viz., the Mondoc, Novadoc, Portadoc, Prescodoc, Sarniadoc, Torondoc,
and the Troisdoc, reported as lost by enemy action, under charter to the govern
ment of Canada or to the government of any of the united nations? If so, to
whom were they chartered, and by whom was such chartering negotiated?