The other side of this question can be found here: How to use heavier soldiers
Imagine if tomorrow we find a way to create soldiers that are almost exactly the same in every single way as our current ones, just lighter. They have the same stamina, the same carrying capacity (not counting their weight*), they are the same size, aren't fatter or thinner and have the same amount of energy stored in their body.
Let's say for convenience sake that they can be anywhere between 20 kilo's lighter to a mere 10 kilo's in weight.
My question is how these soldiers would be used in our current day and age. What tasks would they be put to compared to their "normal" soldier counterparts.
*This means that if an 90 kilo normal soldier can carry 20 kilos of gear effectively, that the light soldier even if he weighs 10 kilos can still carry 20 kilos of gear and still have just as much stamina etc.
I'm not interested in what they specifically won't be doing, I just want to know what tasks they would fulfill as infantry (yes some will definitely make it as pilots of aircraft or similar but this is about infantry). Would always take point in an infantry formation or always hold back. Would they carry specific weapons to aid in their task etc.