Wrong. The National Guard was created in 1903 as a way to get around the Congressional controls that kept the Army small. It federalized the current State militias, which were classified as "Organized Militia" under the control of their various governors.And as history has shown, became the NG and an ipso facto branch of the US army.
Had nothing to do with the "Unorganized Militia".
Even the Defense Act of 1916 only dealt with turning the State Militias into federal units.
The National Guard, as of 1916 IS a part of the US Army.