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We searched the WWII Operations Reports in the Records of the Adjutant General's Office, 1905-1981 (Record Group 407) and located approximately 250 pages of historical reports for the 492nd Port Battalion for 25 January 1943 to 10 May 1946. We also located a historical summary of the 231st Port Company for July - November 1945. For access to and/or copies of these records, please contact the National Archives at College Park - Textual Reference (RDT2) via email at firstname.lastname@example.org.
Here is a little background information for you. The port battalion/port company formations were, in essence, longshoremen in uniform. Stevedore is an older term similarly used for personnel who loaded and unloaded cargo ships. Up until the 1960’s, cargo ships were considered “break bulk” freighters whose cargo holds were loaded/unloaded in single pieces or in cargo nets like you see here:
In the days before intermodal transport, the only way to get large quantities of freight overseas was through the use of break bulk freighters. The USS Serpens (AK-97) was an example of a Liberty ship, a mass-produced break bulk freighter unique to World War II.
It took a large number of men to load and unload ships like the Serpens (more men than the ship’s crew)--to run the booms on the ship; to move the cargo in the holds under the booms or to move the cargo in the hold out from under the booms; to spot the cargo on the shore or onto the lighter (barge); and so on. These were the days before forklifts were readily available on ships--the cargo had to be manhandled into place almost every step of the way. So to assist the ships’ crews, the Port Battalions/Companies were used to make the loading/unloading of the ship’s cargo as quick as possible. While shipping companies during peacetime want a quick turnaround in getting their ships in and out of port in order to maximize profit, in wartime, a naval commander wants a quick turnaround to ensure the safety of the cargo ships from enemy attack. The Port Battalions/Companies were key to that concept.
For more information about the work of the Port Battalions, there is this website:
And there is apparently an ebook available from Osprey Publishing called Longshore Soldiers. Unfortunately the book’s focus is on the European theater, but it should include the functions of the Port Battalions.
And lastly, the Library of Congress also has a collection of veterans’ oral histories of which one, that of Daniel T Mihuta, speaks about service in your uncle’s unit.
We hope this information is helpful. Best of luck with your research!