[PsychoTechFreak]

Yes, but Damage Resistance is the important point regarding this issue:

Name := Basic Life Support
Description := Mechanical means to generate a livable atmosphere on a starship. This system is not built for compactness, or to withstand battle damage, but is less difficult to manufacture.
Pic Num := 5
Tonnage Space Taken := 15
Tonnage Structure := 1

This component is extremely hard to hit. And if I carry over this idea to the proportions troops, with an extremely higher damage resistance, they would be easier to hit than they have been before.