Anything that's not part of a 'militia'. It's all about that one word, isn't it...
I'm sorry, but are sportsmen, farmers, gamekeepers and huntsmen part of a militia?
What about rangers, parkkeepers, and policemen?
As for the dictionary definition:
militia
Use Militia in a sentence
mi·li·tia
[mi-lish-uh] Show IPA
noun
1.
a body of citizens enrolled for military service, and called out periodically for drill but serving full time only in emergencies.
2.
a body of citizen soldiers as distinguished from professional soldiers.
3.
all able-bodied males considered by law eligible for military service.
4.
a body of citizens organized in a paramilitary group and typically regarding themselves as defenders of individual rights against the presumed interference of the federal government.
1. An army composed of ordinary citizens rather than professional soldiers.
2. A military force that is not part of a regular army and is subject to call for service in an emergency.
3. The whole body of physically fit civilians eligible by law for military service.
You can see where problems would arise in defining the word militia in the constitution, does it mean all able bodied citizens? Does it just mean the national guard (which is what number one and two of both of those seem to mean)?
You really have to take the second amendment in the context of what they meant by militia, but then theres the 'right to bear arms' part.
I wonder if any other countries have parts of their constitution that are problematic like the second amendment.