M16A1 Springfield is a character from the mobile strategy game and anime series 'Dolls' Frontline'. She is a Tactical Doll (T-Doll), a type of android designed for combat, based on the real-world M16A1 rifle. With a strong personality and dependable nature, Springfield serves as a support and combat unit, offering guidance and assistance to her fellow T-Dolls. She is known for her leadership skills and acts as a big sister figure within her squad, often taking on a protective role to ensure the safety and success of her team.