Dear Mr. Krogh,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located the World War II Operations Reports, 1940-1948 in the Records of the Adjutant General's Office, 1917 - 1985 (Record Group 407) that includes records of the 16th Infantry Regiment, 1st Infantry Division during WWII. Since the 16th Infantry Regiment took part of the Louisiana Maneuvers, we located 15 file units of various series in the Records of Headquarters Army Ground Forces (Record Group 337) that pertain to those training exercises during WWII. We also located the Infantry Training Records , 1922 - 1950 in Record Group 337 that may include the 16th while at Fort Benning. Plus, you may be interested in the records described in Reference Information Paper 78, A Finding Aid to Records Relating to Personal Participation in World War II ("The American Soldier" Surveys). For more information about these non-digitized records, please contact the National Archives at College Park - Textual Reference (RDT2) via email at email@example.com.
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Next, we suggest consulting The Personnel of the Army of the United States: Information Regarding the Appointment, Enlistment, and Induction of Commissioned Officers, Army Nurses, Warrant Officers, Cadets, Officer Candidates and Enlisted Men, March 26, 1942 that provides some information about the various ways that a person could enter the military and the procedures used. The Procurement and Training of Ground Combat Troops by Robert R. Palmer, Bell I. Wiley and William R. Keast from the U.S. Army Center of Military History may be useful. And the U.S. Army Heritage & Education Center, 950 Soldiers Drive, Carlisle, PA 17013, has a large collection of published unit histories, including The 16th Infantry Regiment, 1798-1946 edited by John W. Baumgartner. This history of the 16th is available for viewing online via the HathiTrust. There are additional resources listed in this previous post that may also be helpful to you.
Lastly, you may wish to contact state archives or county historical societies for information regarding local induction centers and the experiences of World War II veterans from Delaware, Ohio, and Pennsylvania.
We hope this is helpful. Best of luck with your research!