Sierras are sniper units in the SWAT team, they are side characters in the story, tasked with providing overwatch from different angles in concealed and relatively safe positions. Sierra teams must cooperate with teammates, and respond to threats with unmatched precision and extremely quick reaction time. (NOTE: Please use a mic that has statics but can still be heard clearly for radio transmissions dialogues (marked with an "R" at the end of the dialogue.)