Dear Mr. Kinane,
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 may include records of the 290th Combat Engineer Battalion during WWII. For more information about these records, please contact the National Archives at College Park - Textual Reference (RDT2) via email at email@example.com.
Copies of most of the monthly rosters from November 1912 - 1943 and morning reports for Army units from November 1912 to 1959 are in the custody of the National Archives at St. Louis (RL-SL). For access to these records, please contact RL-SL via email at firstname.lastname@example.org. Rosters for units serving in World War II from 1944 - 1946 were destroyed in accordance with Army disposition authorities.
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 & RL-SL. We apologize for this inconvenience and appreciate your understanding and patience.
We hope this is helpful. Best of luck with your family research!