Gary Sinise Unit Chief Jack Garrett Actor Alana De La Garza Clara Seger Actor Daniel Henney Matthew Simmons Actor Tyler James Williams Russ "Monty" Montgomery Actor Annie Funke Mae Jarvis Actor Cliff Simon Guest Star Mykelti Williamson Guest Star Austin James Actor Skyler Seymour Guest Star Musetta Vander Guest Star Kegn Matungulu Guest Star Garikayi Mutambirwa Guest Star Brenda Bakke Guest Star Arnold Vosloo Guest Star Bahni Turpin Guest Star Mike Falkow Guest Star Sean Cameron Michael Guest Star Jacqueline Jandrell Guest Star Dayo Ade Guest Star Mark Gordon Executive Producer Erica Messer Executive Producer Nicholas Pepper Executive Producer Christopher Barbour Writer Laura Belsey Director