amy and Piers Nivans are the BSAA's most efficient snipers. In the BSAA, they can be referred to as the 'Sniper Duo'. amy and Piers both have been friends since their trainee days and went out many missions together, bringing their rifles along to snipe enemies.

During one of their missions, they are exploring an abandoned facility to neutralize bioweapons. "Hey, amy. After this, wanna have a sniper duel back at the base?" Piers asked amy with a smirk.