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The film closes with the following written statement: "Our grateful appreciation to the United States Coast Guard...whose generous cooperation made this motion picture possible." Daily Variety announced in November 1956 that Warner Bros. had purchased the film rights to Onionhead, a novel by Weldon Hill that had yet to be published. The Hollywood Reporter review noted that the film closely followed the original story's plot. As noted in reviews, Onionhead was a follow-up to No Time for Sergeants, the extremely popular Warner Bros. film starring Andy Griffith as a hillbilly drafted into the air force. The production was suspended for one week in late November 1957 when Griffith contracted the Asiatic flu, according to studio press materials. Press notes add that many scenes were filmed on location at the Coast Guard station in Alameda, CA and aboard the U.S.S. Heather, which was stationed in Long Beach, CA. Hollywood Reporter news items add the following actors to the cast: Mina Vaughn, Sal Sportelli, Paul Marianetti, Chuck Hicks, Frederic Ford, Alan Gifford, Fred Eisley, John Bontiz and Charlene James. Their appearance in the final film has not been confirmed.