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Because of its association with these virtues, the sphinx was selected by the War Department in 1923 as the most appropriate symbol to represent the newly established Military Intelligence (MI) Officers' Reserve Corps, an association of World War I veterans with experience and interest in intelligence.
The Strategic "Unready" Reserve: 1916-1960s In 1916, using its constitutional authority to "raise and support armies," Congress passed the National Defense Act, which created the Officers' Reserve Corps, Enlisted Reserve Corps and Reserve Officers' Training Corps.
When Congress declared war against Germany in 1914, "Teddy" resigned his position as a partner in an investment backing firm and joined the Officers' Reserve Corps.