District of Columbia v. Heller, 554 U.S. 570 (2008) - The Court ruled the Second Amendment to reference an individual right, holding:

"The Second Amendment guarantees an individual right to possess a firearm unconnected with service in a militia, and to use that arm for traditionally lawful purposes, such as self-defense within the home."

Unconnected to service in a militia.

If you're gonna cite this you shouldn't cherry pick. Scalia goes on to say this

 “Like most rights, the right secured by the Second Amendment is not unlimited…”. It is “…not a right to keep and carry any weapon whatsoever in any manner whatsoever and for whatever purpose.”