"They absolutely did. The power to compel a person to purchase a good (health insurance) in order to remain a citizen in good standing (in compliance with law) was not even upheld by the court, it was injected into the government's argument by the court itself - the government was actually arguing against it - so long as the penalty is considered a tax. This actually happened, and not long ago."
There are legitimate arguments on both sides of that issue. (The dissenting justices made that clear.) But that's hardly "unlimited power."
Nor is it, as some people have contended, the first time the U.S. government has compelled people to buy something. The Militia Act of 1792 required every able-bodied adult male to "provide himself with a good musket or firelock, a sufficient bayonet and belt, two spare flints, and a knapsack, a pouch, with a box therein, to contain not less than twenty four cartridges, suited to the bore of his musket or firelock, each cartridge to contain a proper quantity of powder and ball; or with a good rifle, knapsack, shot-pouch, and powder-horn, twenty balls suited to the bore of his rifle, and a quarter of a pound of powder; and shall appear so armed, accoutred and provided, when called out to exercise or into service" in the militia - which every able-bodied adult male citizen was required to join.
To get back closer to model building - I confess I feel sorry for the Finnish Air Force. During WWII its main wing and fuselage insignia was a pale blue swastika on a white disk. (The swastika in Finnish tradition had nothing to do with Nazism.) The model companies feel obliged to sell Finnish versions of kits with all sorts of strange markings - crosses, plain white disks, whatever.
I recently read an article in Aeroplane Monthly (great magazine) about the Finnish Air Force in WWII. Those pilots - and ground crews - performed remarkable feats - usually with inferior equipment (e.g., Brewster Buffaloes). The article pointed out that on a list of the top-scoring aces of WWII, Germany (of course) had the most. Finland was second. I didn't know that.
I wonder whether any court in any of the "no swastika" countries has actually ruled specifically on the subject of historical decals in model kits. If so, I haven't heard about it. I suspect the kit manufacturers are just playing it safe.