Regarding the lawyers "militia" claim - The 6th Charge is -
possession of a dangerous weapon by a person under 18 - which the charge sheet says violates "948.60(2)(a) and 939.51(3)(a) Wis Stats" and it becomes a "State vs Federal" law issue, where the Federal law under Amendment 2A for militias may have been over-ridden by state laws (which isn't allowed to happen), and that is the issue that needs resolving - Do these specific state laws over-ride Federal laws?
For clarity, the state laws that the shooter has been charged with violating are these -
However 948.60(2)(a) has 3 caveats which may have an impact on the case -
and these are -
There are a group of 4 caveats within statute 29.593 which allow someone under 18 to not require a "hunting License" but I believe that none of these will apply to the shooter -
Based on my reading of 29.593 I would say that, despite the shooters lawyer claiming the he was part of a "militia" that will not be able to be proven conclusively the shooter will be found guilty of violating 29.593, which gives a maximum of a 9 month sentence.
These statutes can all be found here -
https://docs.legis.wisconsin.gov/statutes/statutes/ - for those who want to read them themselves.