The reason the original castle set from 1978 was yellow and not gray is that LEGO didn’t want to encourage kids to build military stuff. All that changed with the abundance of gray in the Star Wars sets. Still they had similar hesitancy with olive green. It took the Pixar Cars line in 2011 to introduce the color and military builders rejoiced. So there, the joke is on you, LEGO! (That was much funnier when I thought of it earlier today.) While this particular shade of green is now available in many sets, it’s still a difficult color to amass in large quantities. That is just one of many reasons why this rough and tumble Soviet Ural-375D by Rolands Kirpis is so impressive. Another reason is each axle and the steering functions are run by Power Functions motors. It took a year to collect all the right parts to build this model but the end result is as mighty as the Ural mountains.