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Dear Mr. Schneider,
Thank you for posting your request on History Hub!
We reviewed the file units of the series Central Decimal Correspondence Files, 1951 - 1952 in RG 407 and it is arranged as stated in the Catalog series description -- Arranged into two subseries: decimal files and project files. The “decimal files” subseries is arranged according to the War Department Decimal File System. The “project files” subseries (beginning with box 971) is arranged by subject (special projects; civil education; commands and corps areas; aviation schools; flying fields; military schools; military posts and reservations; U.S. cities, lakes, etc.; states and countries; foreign countries; and nautical vessels).
The 3 boxes you are interested in are part of the special projects section of the project files subseries. One of the special projects is Org Res (Organization Reserve Command). These file units are arranged by the War Department Decimal File System and thereunder, arranged in reverse chronological order. Most of the Org Res file units are filed under Decimal 322. They are not arranged by type of service branch, command or locality.
We hope this information is helpful. Best of luck with your research!