What is the significance of the stars above troops?

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In the first Halo Wars, if any of your troops kill enough enemies, the gain stars above their heads. Do these stars have any significance such as making the troops stronger in either damage or health (or both)? Or is just purely to show that they have killed a significant amount of people/experience?
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ADRIAN plays THE STARS ABOVE Mod in Terraria...
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Images: Brett Sayles, Happiness Maker, Brett Sayles, Skylar Kang