Handling and Releasing Homing Pigeons from Aircraft In Flight - Restrictions Page

"The publication may be used by personnel rendering service to the United States or its Allies" pronounces this manual page.

US Army Air Forces technical manual, "Handling and Releasing Homing Pigeons from Aircraft In Flight," T.O. 01-1-120, August 1, 1943. Page explains the "restricted" classification of the document.