I'll keep an eye out for such a report.
My experience within Record Group 156 has been this:
Sometimes reports of the type you want are only cataloged way down in the heirarchy of the original War Department cataloging system for that particular collection of letters/reports, if cataloged/indexed at all. You may have to go through a promising-sounding entry for quite a while just to find one of these old indexes. Then you can find a date and serial number for the letter/(report).
Then you request the "shoe boxes" for letters/reports in that date range. Then you paw though the tightly-packed, treble-folded letters stacked, on end, in the shoebox to find the particular letter/report. If you are lucky and it wasn't lost long ago, you'll find it.
If you can't locate an index, you have to go through each letter/report, looking at the brief synopsis, date, and sender penned onto the back of each folded letter.
There's more virgin material in the National Archives than most people would ever believe. I don't mind spending time looking through it because in the process I always find many other things I wasn't looking for that are tremendously interesting.
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