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Dear Mr. Fujiguchi,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located a series titled Audio Recordings of Radio Broadcasts of Speeches, Interviews, Combat Reports, Special Events, Public Affairs, and Entertainment for U.S. Troops, 1932 - ca. 1952 that included an item titled SECRET MISSION INSERT - ADMIRAL ZACHARIAS. This sound recording is in the custody of the National Archives at College Park - Motion Pictures (RDSM). There may be other recordings by Zacharias. Please contact them via email at firstname.lastname@example.org
We hope this information is helpful. Best of luck with your research!
Thank you for replying.
I will send them e-mail immediately.