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Dear Members of the Port Chicago Witness,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located 12 file units that pertain to Port Chicago explosion on 17 July 1944. For access to these records, please contact the NARA unit listed in the file unit description. Other records may be available at the National Archives at San Francisco (RW-SB). Please contact RW-SB via email at firstname.lastname@example.org.
Additional information pertaining to the Port Chicago explosion is available on the Navy Historical and Heritage Command web site at https://www.history.navy.mil/content/history/nhhc/research/library/online-reading-room/title-list-alphabetically/p/port-chicago-ca-explosion.html. Also, according to the Navy Historical and Heritage Command, there was a William Allaire Snedeker in the Navy.
We hope this is helpful. Best of luck with you research!