O is for Ogre
You may have been laboring under the widely held delusion that Ogre Miniatures, the Steve Jackson Games product, was a 6mm scale (1/285 or 1/300) game. You would be quite mistaken, my friend.
For, you see, once upon a misty morn, many moons ago, there was a 15mm Ogre 'macroture'. Several of them, actually. They made at least the Mk. III Ogre and some Paneuropean Galahad-class GEVs. I know of at least one Mk. III still out there. I want one, really badly. If only to see the look on the other guy's face when you carefully set it on the table. Carefully, because the thing is huge.
Picture Shamelessly Stolen from Brazos Evil Empire Blog
Notice the 15mm infantry for scale...
Here's the Galahad...
Photo from Steve Jackson Games
So, there they are... to my knowledge the only models made in this scale for Ogre. I'd buy a Mk. III if someone made more. Or a Mk. III-B. Or a Mk. V. Or a Mk. II. A Mk. VI would just be silly, though. Wouldn't it?