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Dear Ms. Tucker,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located 38 series and file units pertaining to the 198th Infantry Brigade in Chu Lai, Vietnam in Records of U.S. Forces in Southeast Asia (Record Group 472). The records are not yet digitized and available in the Catalog. For access to and/or copies of these records, please contact the National Archives at College Park - Textual Reference (RDT2) via email at email@example.com.
Photographs of various U.S. Army, Navy, and Marine Corps activities dating from 1940 to 2007 are in the custody of the National Archives at College Park - Still Picture (RDSS). Please contact RDSS via email at firstname.lastname@example.org and their web site is https://www.archives.gov/dc-metro/college-park/photographs-
We hope this is helpful. Best of luck with your research!