Gaines

Gaines was an American soldier who fought under Lt. Vasquez's command against OpFor troops, as seen in Call of Duty 4: Modern Warfare.

When his unit came across War Pig in The Bog, Vasquez ordered Gaines and Lopez to cover Sgt. Jackson when taking out the enemy ZPU-4. Since he is not seen among the squad, he probably died around the time Vasquez order him to cover Jackson.

If he did survive the the fight for War Pig on Day 3, he was most likely killed when the nuclear explosive went off the next day.