I recently picked up a little booklet called "The Army Song Book". The fly leaf reads:
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Compiled by THE ADJUTANT GENERAL'S OFFICE in collaboration wiht THE LIBRARY OF CONGRESS and published by order of the SECRETARY OF WAR.

This book is the property of the United States Government and its contents may be used only wiothin the military services.

1941
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It is also rubber-stamped as follows:

SPECIAL SERVICE OFFICE HQRS., THIRD ARMY.

I suspect the versions contined bear little resemblance to what was actually sung!

Regards