In the US the National Guard is part of the reserve military with units by state
My brother use to be in the National Guard.
Yeah they are members of the Guard and the Military at the same time  state and federal levels
He did it for 5 years.
. National Guard units are under the dual control of the state and the federal government.
The majority of National Guard soldiers and airmen hold a civilian job full-time while serving part-time as a National Guard member. These part-time guardsmen are augmented by a full-time cadre of Active Guard & Reserve (AGR) personnel in both the Army National Guard and Air National Guard, plus Army Reserve Technicians in the Army National Guard and Air Reserve Technicians (ART) in the Air National Guard.
declaration of a state of emergency by the governor of the state in which they serve. Unlike Army Reserve members, National Guard members cannot be mobilized individually (except through voluntary transfers and Temporary DutY Assignments TDY), but only as part of their respective units. However, there have been several individual activations to support military operations since 2001.
Dual missions, state and federal Federal mission.
When National Guard troops are called to federal service, the President serves as Commander-In-Chief. The federal mission assigned