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In page Missing in action:

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According to official US Department of Army and Department of Navy casualty records, submitted to Congress in 1946 and updated in 1953, the combined possible total of missing service personnel worldwide is closer to approximately 6600 and probably considerably fewer[citation needed]. Significantly, DPAA continues to list as "unaccounted for" the five Sullivan Brothers—arguably the single most accounted-for group of WWII casualties ever recorded. Since DPAA alone designates such WWII personnel as the entire crew of the USS Arizona and most of the crew of the USS Oklahoma as both "missing" and "unaccounted for" it is likely that DPAA records keeping is irregular and prone to opinion rather than fact.