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The opening onscreen credits read as follows: "The United States Navy presents This Is Korea!, the Story of the 7th Fleet and the 1st Marine Division, filmed by the United States Navy and United States Marine Corps photographers." Following a brief list of credits, an acknowledgment appears, thanking the "comrades of the Eighth Army and the United States Air Force." This Is Korea! is presented in montage style, with voice-over narration throughout the film. John Ford's onscreen credit reads, "Supervised by Rear Admiral John Ford U.S.N.R.(Ret.)." According to the Daily Variety review, the original 16mm combat footage was blown up to 35mm three-color Trucolor. Several military leaders are shown, including Gen. Douglas MacArthur and Gen. Lewis B. "Chesty" Puller, who later became the subject of director Ford's last completed project, the made-for-television documentary, Chesty: A Tribute to a Legend (1976).
According to the Daily Variety review, proceeds from the film were given to the Navy Relief. A modern source adds George O'Brien as a narrator, Frank Nugent as a writer and Charles Bohuy, Bob Rhea and Mark Armistead as photographers. Although onscreen credits suggest that the Navy produced the film, a modern source says that the film was financed by Republic Pictures. Some modern sources comment that This Is Korea! differs from Ford's earlier war documentaries because it downplays propaganda and rarely shows the enemy.