Brock Rumlow is an ex-military man who became a mercenary.
To be added
Skills and abilities
- Martial Arts: Crossbones is an exceptional martial artist, having received training in the military, and presumably from other sources. His victories include defeating and almost killing Spider-Man in combat.
- Fencing: Crossbones is an excellent fencer, using an oversized, sword-length knife against Spider-Man.
- Marksmanship: Crossbones is a crack shot with a gun. The only reason he didn't kill Spider-Man when he fired at Spidey, was because Spidey's average speed is enhanced, making it easier to dodge bullets.