What type of units are you researching? Army, Army Air Force, Navy, or Marines?
Also, could you provide the names of the specific units you are researching?
My apologies for my late response! There are many different units I am researching, since I am researching the servicemembers from my hometown that served in World War II. If I had to provide an example unit from each branch, I guess I'd use the following:
Army - Company E, 182nd Infantry Regiment, 23rd "Americal" Infantry Division
Navy - USS Massachusetts
Army Air Force - 22nd Bomb Squadron, 341st Bomb Group
Marines - Company G, 1st Marine Regiment, 1st Marine Division
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Dear Ms. Hendrickson,
Thank you for posting your request on History Hub!
Because you are researching units and ships from different services, the records related to these units will not all be in the same record group or record series. Instead, each branch of the service will have several different record series with information about individual units.
Records related to Navy ships and units include the Logbooks of U.S. Navy Ships and Stations, 1941 - 1983 in the Records of the Bureau of Naval Personnel (Record Group 24); as well as the World War II Action and Operational Reports,the U.S. Submarine War Patrol Reports, 1941 - 1945, the World War II Command Files, and the World War II War Diaries, Other Operational Records and Histories, ca. 1/1/1942 - ca. 6/1/1946 in the Records of the Office of the Chief of Naval Operations (Record Group 38).
In regards to Marine records, the Records Relating to United States Marine Corps Operations in World War II, 1939 - 1949 in the Records of the U.S. Marine Corps (Record Group 127) that consists of records documenting the principal amphibious assaults and ground combat operations of the Marine Corps during the World War II era, as well as occupation of formerly enemy-controlled areas.
Army ground unit records are mostly located in the record series World War II Operations Reports, 1940-1948 in the Records of the Adjutant General's Office, 1917-1985 (Record Group 407) and the Unit Histories, 1943 - 1967 in the Records of U.S. Army Operational, Tactical, and Support Organizations (World War II and Thereafter) (Record Group 338). Also there are some cases where additional records related to a unit may be located in other record series and record groups. For example, we searched the National Archives Catalog and located 6 record series and 23 file units relating to the Americal Division.
Army Air Force unit records in National Archives custody include World War II Combat Operations Reports, 1941 - 1946 in the Records of the Army Air Forces (Record Group 18) for those that served in Europe.
For more information about the World War II unit records listed above, please contact the National Archives at College Park - Textual Reference (RDT2) via email at Archives2reference@nara.gov.
Due to the COVID-19 pandemic and pursuant to guidance received from the Office of Management and Budget (OMB), NARA has adjusted its normal operations to balance the need of completing its mission-critical work while also adhering to the recommended social distancing for the safety of NARA staff. As a result of this re-prioritization of activities, you may experience a delay in receiving an initial acknowledgement as well as a substantive response to your reference request from RDT2. We apologize for this inconvenience and appreciate your understanding and patience.
Additional unit histories and supporting documents of many Army Air Force units, especially those that served in the Pacific, are in the custody of the Air Force Historical Research Agency, 600 Chennault Circle, Building 1405, Maxwell Air Force Base, AL 36112-6424. These files often include historical reports. Please call (334) 953-5697 or write to that office for further information concerning these records.
We hope this is helpful. Best of luck with your research!