Dear Mr. Pelletier,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located three series titled Algiers, Athens...and Washington Headquarters Files, 1942-1945; Central Files, 1941 -1946 (Box 622, Folder 4); and 3 file units from the series Security Classified General Correspondence in the Records of the Office of Strategic Services (Record Group 226) that includes information on the OSS in Algeria. For access to and/or copies of these documents, please contact the National Archives at College Park - Textual Reference (RDT2) via email at email@example.com.
We also located this article from the Office of the Command Historian that pertains to the OSS influence on Special Forces.
We hope this is helpful! Best of luck with your family research!