Just a bit of nitpicking (I'm the eternal critic
but it's just for improvement eh)
The troop feels less in place, the fighter and the cruiser both have those blue notches on their wings and the blue paint on their wings, maybe you could try and implement that into the troop, I dont know how feasable this is tho.
I'm no modeller, but right now, you can see that the ship and fighter are from the same race, whereas the troop it is less visible.
You might be able to see what it gives if you place ehm rims on the wheels which are the same form as the paint on the wings.
This is just my opinion eh, feel free to ignore it.