He is a US soldier that helped Gerry and his family escape New Jersey.
Due to appearing briefly, nothing much is known about him. He was first seen inside the helicopter, looking for Gerry and his family and later found them after noticing a flare. He later starts shooting at the zombies and managed to escape New Jersey. He was no longer seen in the movie again, thus his fate is unknown but it can be assumed that he is alive unless he went back to the zombie infested cities.