The Militia and Keeping Troops?

[JBeukema]

Constitution. Article 1 Section 10 LIMITATIONS UPON THE STATES

No State shall, without the Consent of Congress, lay any duty of Tonnage, keep Troops, or Ships of War in time of Peace, enter into any Agreement or Compact with another State, or with a foreign Power, or engage in War, unless actually invaded, or in such imminent Danger as will not admit of delay.

Does this only refer to a standing regular army? How does this square with the militias, both 'organized' and 'unorganized'? How do the state National Guards fit in here?