From the in-game bio
A fifteen year veteran of the Desert Rangers, Angie was born into a strict religious community near the southern edge of the Arizona Wastes. When she hit her teens, she rebelled against everything they stood for and in the process, nerly rebelled herself into an early grave. She found the Rangers when she woke up in their drunk tank. Joining them saved her life and she hasn't looked back since.
Angie was in love with Captain Ace and will do anything to help track down his killers. She was also one of the group of Rangers, including General Vargas, that stopped the robot war.