Tolkande trupp in Japan

You can still see this sign saying "Tolkande Trupp" in Sapporo and in Tokyo. When I checked the sign at a different place before, it said: "Belongs to the army of Sweden" on it. It is a sign that the Swedish army uses to alert drivers that they should be careful because the army is doing some training nearby where a bunch of soldiers are holding on to a rope tied to a car (or some other vehicle) and riding along on skis or on bicycles, allowing one car to tow a large number of soldiers quickly and to move a large number of soldiers without them getting that tired. No such activity seemed to be going on nearby, though.