Main cast •
Dennis Haysbert as
Sergeant Major Jonas Blane, aka Snake Doctor •
Scott Foley as
Staff Sergeant Bob Brown, aka Cool Breeze •
Max Martini as
Master Sergeant Mack Gerhardt, aka Dirt Diver •
Michael Irby as
Sergeant First Class Charles Grey, aka Betty Blue •
Robert Patrick as
Colonel Thomas Ryan, aka Dog Patch •
Demore Barnes as
Sergeant First Class Hector Williams, aka Hammerhead
Supporting cast •
Regina Taylor as
Molly Blane •
Audrey Marie Anderson as Kim Brown •
Abby Brammell as
Tiffy Gerhardt •
Rebecca Pidgeon as
Charlotte Ryan •
Kavita Patil as
Sergeant Kayla Medawar
Recurring cast • Susan Matus as
Sergeant Sarah Irvine • Angel Wainwright as Betsy Blane •
Summer Glau as
Crystal Burns •
Daniel Wisler as
Jeremy Erhart • Alyssa Shafer as Serena Brown •
Jon Hamm as Wilson James •
Lindsay Frost as US Senator Elizabeth Webb •
Ricky Jay as CIA Agent Kern •
Conor O'Farrell as General Heath == Episodes ==