1:285 scale or 6 mm figure size is a US Army scale introduced in the late 1960s, and used for wargames and some scale model dioramas. It is used in miniature wargaming to depict large battles in a relatively small gaming area. 1:300 scale (5 mm scale) is an almost identical NATO standard scale. Both figure scales are based on the 1mm = 1ft calculation that reduces the average 1.72m height of a Caucasian male to 5.7mm tall figure. "6mm" is therefore used as a rounded-up reference to the scale.