As a person in my seventies, I don’t remember the National Guard being used for overseas combat years ago. If we want to use the National Guard that way, then we need to have a separate force that is only used for domestic emergencies, probably with less combat training, more civil policing, emergency rescue, etc. type training. Since they could NOT be used for foreign wars, they would also be paid less. We will probably be having more severe hurricanes, forest fires, tornadoes, weird winter storms, and urban strife in future years and need to have more people join up. Some might like to serve in country, but not fight foreign wars, especially if they have young children.
They did use the National Guard in WWII or Vietnam, but that was when an actual draft was in effect. Nowadays, we don’t appear to need a draft to call out National Guard Troops.