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Dear Lassamon Maitreemit,
Thank you for posting your request on History Hub!
Motion picture records of combat operations from the Army, Navy, Air Force, and Marines during the Vietnam War are in the custody of the National Archives at College Park - Motion Picture (RDSM) via email at firstname.lastname@example.org. RDSM also has custody of newsreels series directed at the peoples of South Vietnam, Cambodia, Thailand, and Laos as well as numerous documentaries that reported the war's progress and explained America's strategy in terms of its foreign policy objectives.
We hope this information is helpful. Best of luck on your research!