According to the Bill of Rights, the right to "keep and bear arms" is in the context of the need to have "a well regulated militia." Title 10 US Code, Part A.I.13.311 defines "militia," and distinguishes between the "organized" and "unorganized" militia. Since, IMHO, unorganized is inconsistent with well-regulated, it would be reasonable to consider that the 2nd Amendment only applies to those in the organized militia. This is specifically defined as: the organized militia, which consists of the National Guard and the Naval Militia...so, if you want to "keep and bear arms", go join the Guard!