In 1916, U.S. Congress took measures to update the Militia Act of 1903 and the organization of the U.S. National Guard. The National Defense Act of 1916, Pub. L. 64–85, 39 Stat. 166, which was enacted on June 3, 1916, created the national Reserve Officer Corp Program.
The National Defense Act of 1916 – Reorganized The National Guard And Authorized The Creation Of The U.S. R.O.T.C Program
Hamilton Historical Records 