Greenland is about 4x bigger than Texas and if everything is bigger in Texas that means that everything is 4x bigger in Greenland.

So let’s see, if the Houston PD is only allowed to carry 9mms anymore and Greenland is 4x as big that means GPD carries a 37mm You know what else had a calliber of 37mm? The M3 anti tank gun. Also the m8 greycat which once managed to kill a king tiger tank. If the standard main battle tank is an M1A1 Abrams whith a 120mm smoothe bore gun that means that a M1A1G would carry a 480mm gun, larger than the super battleship Yamato. But wait, there’s more. The largest gun ever manufactured for the US military was the main gun on the Iowa class of battleships with a calliber of 406mm. The US no longer uses battleships but if production were to start again the Iowa G would have a calliber of 1264mm, or 1.5 times the size of the largest gun ever manufactured, the Schwerer Gustav gun. But wait, there’s more. If the Germans were to invade Greenland and start producing the Schwerer Gustav again, they would have to upsize it to a whopping 3200mm. But wait, there is still more. The US mainland is protected by the Minuteman system of ICBMs and Greenland would have to be too. The standard rocket in the Minuteman system is an LGM-30 with a diameter of 17000mm. An lGm-30 would have to be 68000mm or almost 2/3 of the diameter of a Saturn V. These LGM-30s use a MIRV warhead with 10 independent re entry vehicles each with a yield of 30 kilotons. A greenish version of this would pack 40 independent re entry vehicles each with a 120 killoton warhead, allowing it to deliver up to a 4.8 megaton nuclear detonation to a single target.