Nurse Veronica Flanagan Callahan (Taylor Schillng) just returned from a tour of Iraq. She isn’t afraid of her own strength and is incredibly smart. It’s a big change to go from the war to a civilian hopistal and she has a hard time taking a backseat to physicians who haven’t had nearly as much experience as she’s had. Veronica is very streetwise but always puts the patient first. She annoys higher-ups like Dr. Dan Harris (James LeGros) and though Chief of Staff Dr. Alfred Parks (Delroy Lindo) respects her, he can only let her go so far.