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Dear Mr. Matthews,
Thank you for posting your request on History Hub !
We searched the National Archives Catalog and located 5 series pertaining to Operation Cobra in the Records of Headquarters, European Theater of Operations, United States Army (World War II) (Record Group 498) and in the Records of U.S. Army Operational, Tactical, and Support Organizations (World War II and Thereafter) (Record Group 338) that may include a listing of the units involved.
After determining the units, we suggest reviewing the casualty lists and/or morning reports of each of the units. The casualty lists are in the custody of the National Archives at College Park - Textual Reference (RDT2) [email: firstname.lastname@example.org] and the morning reports are in the custody of the National Archives at St. Louis (RL-SL) [email: email@example.com].
For additional information about Operation Cobra, please review pages 198-301 and 323-335 of the U.S. Center of Military History publication titled Breakout and Pursuit.
We hope this is helpful. Best of luck with your research!