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The Snowtroopers originally scouted the planet before it was converted into Starkiller Base and later became security of the base. When General Hux ordered the weapon to fire, many of them were present and serving as guards to the officers. Some of them followed Kylo Ren and entered the Millennium Falcon to investigate later on. A couple of them found Rey and Finn on a stolen Snowspeeder and gave chase in another one. The former Stormtrooper, Finn, managed to shoot the speeder down with his blaster. All of the Snowtroopers on the base were destroyed along with it when Poe Dameron destroyed it from the inside.