The Peloran are far stronger than most Earthborn humans. They were genetically engineered with stronger muscles, denser bones, and better immune systems. They almost never get sick. And they heal far more rapidly than Earthborn humanity. Scratches and cuts usually heal in seconds to minutes. Cracked bones can take a few hours. Broken bones can heal within hours or days depending on how extensive the damage was. They can even regrow limbs if they are completely amputated, though it can take up to weeks depending on how much of the limb was lost. Basically, any wound that doesn’t kill them on the spot will heal in time and leave no physical hint that it ever happened. That’s a powerful ability for a soldier.