So troops will have 30 mins on the ground then suffocate to death?If everyone is using their EVA suit for life support in the ship, that leaves the troops no oxygen to use while in battle on the ground. Most planets/moons will not have breathable atmospheres. And if they do have a breathable atmosphere, you cant open the doors up while in high altitude or you will suffocate your troops.
Think we've just discovered a PLOT HOLE with the mechanics here.