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Dear Ms. Bacon,
Thank you for posting your request on History Hub!
In the Records of the Adjutant General's Office, 1905-1981 (Record Group 407), there the series titled Station Lists, 1942 - 1953 that will assist you to determine what U.S. Army units were stationed in Wales prior to and after D-Day. The lists are arranged by theater (such as European Theater of Operations) and thereunder by date. They were generally monthly or biweekly. Each list is arranged by type of unit and thereunder in order by unit name or number. The nearest town is listed for each unit. There are 13 lists from 7 January 1944 through 21 June 1944 available.
For access to these records, please contact the National Archives at College Park - Textual Reference (RDT2) via email at firstname.lastname@example.org.
We hope this information is helpful. Best of luck with your research!