The weapon laws of Zootopia & Nations Against The New World Order countries, along with the Civilian Militia, Merchant Navy, Merchant Marines, & the Civil Aviation Service explained.

What is the Civilian Militia?

Constitutionally, full member Nations Against the New World Order (NATNWO) countries are required to have all able bodied and able minded citizens who aren’t exempt (which will be explained later) to be trained in the use of military weapons and to store their weapons, ammunition and other pieces of military equipment in their homes, to have lifetime arms licenses and be free to obtain arms other than weapons of mass destruction or certain lethal weapons prohibited for use in war free of tax.

So what this means is, as soon as an able bodied and able minded citizen reaches a certain age, they go to mandatory arms training. Once they complete training, they receive an arms license, which lasts the holder for life.

Civilians with valid arms licenses, unless exempted, must join the civilian militia.
How the civilian militia works is that people are equipped with basic military gear (such as weapons, ammunition, body armor, first-aid kits, radios, compasses, maps, night vision devices, etc) and, more importantly, trained to use that gear.

If a NATNWO country is directly invaded by a conventional force, the populace can be called to be deployed military-style, led by professional military and law enforcement leaders.

Civilians can also create their own private militas (in a similar manner to how private militas in the United States of America works in real life) or opt to join a private militia instead of joining the public militia as long as the private militia meets or exceeds training and equipment requirements of the public militia.

While being deployed in the Civilian Militia, members are generally given jobs that would fit their skillset the best. 
For example, if someone has knowledge in the medical field, they would be given a medical related job, or if someone is an aircraft pilot, they would operate aircraft. 

Becuase of the lack of a strong chain of command and discipline, and the lack of sophisticated heavy equipment, Civilian Militias are primarily defensive forces.

An individual will be exempted if they committed a serious violent crime or threat, and will be barred from possessing a valid license for as long as the law prescribes and the judge working on their case sees fit. There is an appeal to this in which an individual can petition to a judge to gain their rights back, and the judge decides what happens to their arms rights.

An individual can also be exempted from the requirement to keep arms if they have a mental condition that would restrict them from being able to effectively and/or safely handle lethal weapons, but are not barred from obtaining or keeping arms, only exempted from the requirement to keep them.

NATNWO member countries are required to allow valid arms license holders to transport permitted arms from country to country and to allow civilians to possess arms on seagoing vessels, along with aircraft and spacecraft.

Hospital ships can lose some of their protection as such if they have any lethal weapons on deck that are visible, and the use of any weapon can legally be restricted more than other types of ships, with the last rule applying similarly to passenger ships.

If a vessel docks at a NATNWO member country, if an aircraft lands on a NATNWO member country's territory, or any other vehicle that passes through a NATNWO member country's territory, and the authorities find lethal firearms, ammunition, and/or explosive weapons on board, it is easier for them to legally take the weapons if there isn’t a license, paperwork, or other legal document proving that they’re legally possessed/owned, and the weapons may be kept by authorities until proof of legal ownership/possession is shown. This is to cut down on arms smuggling.

And all in all, the essence of rules of engagement in international waters for a NATNWO country flagged vessel is the same as on land; those on the vessel have the right to protect themselves, but must never start violence or attempt to intimidate, harass, or otherwise bother others.

For example, if an arms license holder from Cascadia goes to Korea (in this timeline, South Korea won, and was reorganised under the NATNWO countries), Korea must accept them.

This is to ensure that civilians stay armed, which is to make NATNWO countries harder to attack by land (and to a much lesser extent, air and sea) forces, and even more, to keep national governments from being violently oppressive on their people. All in all, to give the people the options to protect themselves and, if they choose to, others.

Zootopia, unlike other NATNWO countries that require that all able bodied and able minded citizens be trained in the use of weapons and to keep weapons at home, Zootopia does not require that its citizens have weapons, and has no registration system for most types of weapons.

To acquire non-WMD and non-explosive weapons, one must simply be the age of majority and pass a criminal background check before having a weapon(s) transferred to them.

When I talk about “weapons”, they are mainly knives, swords, bows, crossbows, bb guns, airguns, and firearms.

Weapon transfers must be face-to-face. So an armored truck can drive to your home and deliver the weapons to you, but you must be met by the seller or clerk and pass a background check or have a valid Reciprocity permit.

WMD’s, such as chemical, biological, nuclear, or radiological weapons, along with certain weapons prohibited for use in war, are absolutely prohibited, except for deactivated and cleaned delivery systems with the proper deactivation certificate and paperwork.

For one to obtain explosive weapons, they must get a reciprocity permit with an explosives endorsement, and may be subjected to storage requirements.

What are the Merchant Navy and Merchant Marines?

The Merchant Navy comprises of watercraft from jetskis and small barges to large cargo ships and large passenger ships that are either registered to a NATNWO member and/or owned by an entity in the NATNWO, along with the people employed to operate them.
Any floating object (even a log or tire inner-tube) flying a NATNWO flag, or the flag of a NATNWO member country that is in international waters is given protection by the NATNWO.

The Merchant Navy can be made into a Naval auxiliary for their respective NATNWO country's registry or ownership in time of a major war that requires more than government-owned seagoing vessels to transport personnel and/or material items.

The Merchant Marines are people (generally trained and licensed Maritime Security Guards in peacetime, though Civilian Militia members, and even mercenaries may fill this role if there is a shortage of licensed specialists) employed to protect civilian-owned floating objects registered to NATNWO countries, and in wartime, may provide port/anchorage security and act as rear-line guards.
This is similar to how the real-world marines are stationed on Navy ships as a security force and landing force for the Navy.

Like the Civil Aviation Services, both are maritime components of the Civilian Militia.

What is the Civil Aviation Service?

The Civil Aviation Service is the aviation component of the Civilian Militia, and comprises of all aircraft that can carry a "significant" number of passengers and/or cargo that is owned by entities in the NATNWO and/or registered to a NATNWO country, along with the people that it employs.


The aircraft and their crews can be place under the command of the air force of the aircraft's country of ownership or registration in time of a major war that requires more than government-owned aircraft to transport personnel and/or material items, particularly behind military lines.

Trivia:
. I almost called the "Civil Aviation Service" the "Civil Airlift Command" or "Civil Aviation Command".


Disclaimer:
I do NOT own Zootopia, nor the 1973 film Robin Hood, or any of their characters. They all belong to Disney.