What amendment gives you the right to organize a militia?

The Second Amendment of the United States Constitution grants the right to keep and bear arms, which has been interpreted to include the right to organize a militia. It states, "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." This amendment highlights the importance of a militia for the security of the state and the rights of individuals to possess arms for that purpose.