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Try this:
In Photoshop open the unit, pick up the green colour and then make selection by the colour (it's somewhere under the "Selection" command). Cut it by Ctrl+X and then paste it in Windows Paint Brush (Photoshop would make unclear borders between red and green). Fill white places after unit figures with red colour and press Ctrl+A and then Ctrl+W. Set the chamfer and reduce also the heigh.
Then by Ctrl+A and Ctrl+C copy it and paste into Photoshop, where you should have the unit without green around it. Place the layer from Paint Brush below the layer with unit and you should have a unit with shadow.
I think ...
 
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I used this method to shade resources, it might work for units as well.
1) Open the file and make sure it's 8-bit using some Palette and NOT 24-bit (this will keep it from anti-aliasing, in other words, keep a sharp border between two colors)
2) Select the pixels/object you want to give a shadow, preferably Select All and then Deselect the green background, non-contiguous.
3) Right-click, Transform Selection and then drag around the edges with Ctrl to give it a perspective.
4) When you're satisfied, use non-contiguous fill tool on the green part of the selection and voila, you have your shadow!