Pinkham was a marine in the Confederate Marine Corps and leader of the Second Squad of the Special Tactics and Mission Platoon during the Guild Wars. He had larcenous instincts, and enjoyed Scotty Bolger's Old No. 8 Whiskey.
When he heard of Colonel Javier Vanderspool's conspiracy to steal a large amount of ardeon crystalss and resocialize the squad, he joined First Squad in the counterplot. However, the group was ambushed by Kel-Morian soldiers who had sought to betray Vanderspool, and Pinkham was hit with a rocket and reduced into pieces.