Little is known about Anti-Cap. According to his dossier, he enlisted in the Navy after the Oklahoma City bombings, his girlfriend being one of the victims. He completed BUD/S training to become a SEAL, but his psychological profile caused him to be turned down for team assignment.
Desperate, he agreed to undergo an experimental process. The Navy was attempting to make its own version of Captain America using the 'AVX' patch. Loosely based off of the Power Man Process Luke Cage underwent, it was hoped that continued applications of the patch would be a more controllable dosage and keep the subject from going rogue. Unfortunately, the process seemed to aggravate his mental problems. He murdered an admiral overseeing the project. Captain America (Steve Rogers) and the Falcon were sent to take him down. Rogers was wounded by a ricochet, leaving Sam to take him as a solo operative. While in pursuit, Anti-Cap seemed to be hit by a train and killed.