Stone-block half-walls

[VortecusMaximus]

These can be built using stone blocks and act as sandbags without the metal, maybe even stronger than sandbags against bullets but not as strong against explosives or melee damage?

[ManHuntingSquirrel]

Maybe wood would be more balanced as it's vulnerable to fire, just maybe.
And yes, i'm aware of the pun opportunity that i wasted.

[VortecusMaximus]

Maybe both? Having the ability to build fortifications out of a variety of materials could help when you're attacking pirates with drop pods and landing in unknown lands, quickly chop some trees or cut some stone and make yourself some defences.