Private J. Ma was a member of the United States Colonial Marine Corps aboard the USS Sephora when it discovered the USS Sulaco orbiting above Acheron (LV-426) in 2179.


Private Ma was an accomplished marksman, managing to kill 15 Xenomorphs by himself. He was the first Marine to see a Spitter and learn about deadly acid spit.


As Ma was an accomplished marksman, he likely used a M4RA Battle Rifle as his primary weapon, as that was apparently the only long-ranged rifle available to the USS Sephora Marines during the second Hadley's Hope Xenomorph infestation.