...So question and hopefully it doesn't sound to dumb, what is the thought with the blue smear (urban) camo. A skyline sort of thing or?
Blue was the trend then for the first big push to "urban" camo. It was an attempt to solve the color issue vs what else they have available.
Woodland et al is warm toned. Reds and yellows. Yes, if you consider the actual hue, dirt browns are red-toned, grassy or desert colors are yellow toned.
Concrete, asphalt, and metals, are cool and the thinking is that this is what makes conventional camo stick out in urban environments. This esp took hold as e.g. euro cities rebuilt after the war and became less brick, fewer green spaces and trees in the late mid-century, and more concrete and pavement.
So instead of just going cool gray, they went all the way to something visibly blue. I think there was some size-of-target science around it, or that we're shadowed from folks, but it doesn't quite work which is why it's old now. Even can be seen in the quite blue gray of the weird "digital" camo the Brits used for their Berlin det. Some of these blue schemes did as this FV432, tried to split the difference, blue and brown.
Yes, some either aren't good at colors, or just apparently thought that if blue is good, MORE BLUE must be better, hence the dark and very saturated on the rifle above.