[BenLurkin]

"The United States Army has three major components: the Active Component, the U.S. Army Reserve, and the National Guard of the United States. (6) Members of the National Guard of the United States also serve a dual role as members of their state's National Guard under control of the state governors and adjutants general (TAG)."

snip

"National Guard brigades fall under their division commanders for combat training purposes and their state TAG for state missions."

'The integrated Active and Reserve Division: background, legal foundation, and the role of judge advocates' http://www.findarticles.com/p/articles/mi_m6052/is_2003_March/ai_102910511

[BenLurkin]

In other words the National Guard can only be deployed by a governor for law enforcemnt purposes.


See also:

A Brief descirption of the U..Miliatry
http://www.rand.org/publications/MR/MR981/MR981.app.pdf

National Guard forces normally operate in state active duty (SAD) status when responding to disasters and civil emergency. During such assistance efforts, one of their primary functions is to reinforce law enforcement agencies. The National Guard, once federalized, like the Active Army, becomes bound by the Posse Comitatus Act and loses the ability to act as a law enforcement agency.
http://www.globalsecurity.org/military/library/report/call/call_93-6_chap9.htm\

Posse Comitatus Act
http://www.uscg.mil/hq/g-cp/comrel/factfile/Factcards/PosseComitatus.html