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Hi Lester -- thanks for posting to History Hub!
According to his obituary in the Washington Post, Albert Hermann served as an administrative aide to Sen. W. Warren Barbour and Sen. H. Alexander Smith before joining the RNC. Sen. Barbour died in 1943, but Sen. Smith served in the Senate from 1944-1959.
Next I checked the Congressional Directory, which is the official directory of the U.S. Congress prepared by the Joint Committee on Printing and made available during the first session of each new Congress. The Wikipedia article very helpfully links out to where each Directory can freely be found online for each year it's available.
In the Congressional Directory volume for the 79th Congress, 2nd Session (1946) Hermann is listed as Sen. Smith's secretary (pg. 273) and Sen. Smith is listed as serving on the Committee on Military Affairs (pg. 209)
With this information, I would guess the letter you have was signed by Hermann in his capacity as aide to Sen. Smith regarding the Senator's work on the committee.
Thank you Sarah - That certainly explains why someone not on the committee would have signed the letter.
Once again, I truly appreciate your help.