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Dear Ms. Hively,
Thank you for posting your request on History Hub!
According to the U.S. Army Vietnam Order of Battle, the 1st Engineer Battalion was attached to the 1st Infantry Division, not the 5th Combat Engineer.
Army Signal Corps, Air Force, Navy, and Marine Corps photographs taken during the Vietnam War are in the custody of the National Archives at College Park - Still Picture (RDSS). For access to these photographs, please contact RDSS via email at firstname.lastname@example.org. Their web site is https://www.archives.gov/dc-metro/college-park/photographs-dc.html.
We hope this information is useful.