Krauser is a first class soldier with plenty of experience leading multiple successful missions, leaving extraordinary achievements.

He fought non-stop every single day of his life, even on his days off as a mercenary, because fighting was all he knew and that's what gave his life meaning.

His skills are totally unparalleled in the US Military, which means he's not only the very best soldier, he's on a whole different level than everyone else, even among elite special forces units. He was so good he was handpicked to work for an Anti-BOW task force(far superior to regular special forces units) as Leon's partner on the Operation Javier mission.

During the mission, Krauser gravely wounded his arm and was discharged from the military. After that, he focused on his mercenary work and became the best gun for hire in the world, with the mysterious organization Ada works for (which secretly maneuvers in the background of global affairs) doing extensive research on his abilities and testing his skills both on and off the battlefield to make sure he was the best. All this while having a SINGLE functional arm.

Then later he contacts Wesker and starts working under him as his top hitman doing a number of missions, including the kidnapping of the US President's daughter from under the US government watchful eyes in order to ingratiate himself to the Los Illuminados cult's inner circle. Again, while only having a single arm.

In the in-game dialogue, he says he can see Leon's every move, implying he has body movement reading abilities.

When Leon defeated Krauser, Saddler was so impressed that he decided he'd turn Leon into his personal bodyguard after the las plagas took control of his body.

Strength

While in a weakened state, Krauser crushes and twists a thick reinforced steel beam in his grip, tears it in half before throwing it with enough force to cause the concrete ground to explode, sending chunks of the ground flying.

Speed

Krauser can casually move faster than the eye can see while covering large distances in an instant, and dodges point blank bullets after they're fired off as a counterattack in the middle of combat.

Agility

Casually back flips 30 ft high into the air.

Shows off his agility and acrobatics while dodging gun fire.

Durability/Healing factor

Krauser survives getting shot, stabbed and slashed so many times a large chunk of his chest is destroyed and his heart literally explodes inside his chest, then he gets caught in an explosion powerful enough to destroy two stone towers. He's still alive.

Mutation

Krauser can turn his arm into a giant blade which can convert into a shield made of organic metal stated strong enough to block and deflect missiles.

Using his mutated arm, Krauser dashes through super tough, bullet resistant ganados with enough force to explode their entire bodies like water balloons.