text: Maybe you are the one who needs to read the constitution again. The full line is
  A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms shall not be infringed. The "people" is what it says. 
  The citizen militias were regulated by the officers and already had a structure in place. The militia were not National Guard or reserves or Army, they were citizens or what we call civilians today.