Military vehicle modelers build a wide variety of models. Tanks and other armored fighting vehicles are the most popular subjects at model contests. Modelers also build ordnance, military trucks, tractors, half-tracks, artillery, and lighter vehicles such as jeeps and motorcycles. Models may be displayed in stand-alone mode, that is, with no base, or on a decorative base, often with a label of some kind. More elaborate bases may include scale scenery, intended to depict the setting in which the vehicle served. This trends towards the closely related hobby of diorama building.