Camp Grayling, near Grayling, is located primarily in Crawford County, Michigan, and spreads over three counties. Camp Grayling is the main training facility for the Michigan National Guard and is the largest US National Guard training facility in the USA.Camp Grayling was founded in 1913 on an initial grant of land from Grayling lumber baron Rasmus Hanson to the State of Michigan for military training. It includes 147,000 acres (590 km2) in Crawford, Kalkaska and Otsego counties.