The National Guard is a state-funded branch of the United States Army, as opposed to the Army Reserve, which is funded at the federal level. While technically imagined as the more stateside division of the military, the National Guard has been deployed overseas many times since their inception. At the peak of troop deployment during the Iraq War, 40% of American troops were National Guard.
In contrast to active duty soldiers, the National Guard is more like a part-time job for those enlisted. They train one weekend a month, along with a two week long period of training each year, and go active duty only when called on to do so. This often earns them the monicker of "Weekend Warriors".