Meghan J. Castellano, known by her call sign Valkyrie, is a prominent character in the tactical shooter series Tom Clancy's Rainbow Six. She serves as a defending operator in the game and is renowned for her strategic prowess and surveillance skills. Valkyrie is known for her unique ability to deploy 'Black Eye' cameras, providing crucial intelligence to her team. Her military background in the Navy SEALs adds depth to her character, as she brings a wealth of experience and tactical acumen to the Rainbow team, making her an invaluable asset in defensive strategies.