aka: Captain Nick Medhurst Played by: Oliver Chris
Captain Nick Medhurst, ATO, is the wise-cracking bomb disposal expert who does the long walk.
aka: Lance Corporal Simon Lansley Played by: Stephen Wight
Lance Corporal Simon Lansley has one job: to protect Nick, the bomb guy. He's good at that. But he has bigger ambitions: to apply to Sandhurst and become an officer. But he is 'not officer material' according to his regiment.
Lt Col Smith
aka: Lieutenant Colonel Philip Smith Played by: Tony Gardner
Lieutenant Colonel Philip Smith has been to more places and seen more things than he would care to remember.
aka: Corporal Lynda Bird Played by: Katie Lyons
Corporal Lynda Bird (aka Bird), the ECM (Electronic Counter Measures) operator, just wants to be one of the lads. And she pretty much is - she can go toe-to-toe with the rest of her team when it comes to swearing or fighting.
aka: Private Euan Armstrong Played by: Scott Hoatson
Private Euan Armstrong (aka Rocket) is from Pilton, Edinburgh.
aka: Private Kevin McDowell Played by: Jamie Quinn
Private Kevin McDowell (aka Mac) is from the East End of Glasgow. He has an encyclopaedic knowledge of filth and nonsense.
Played by: Keeno Lee Hector
Faruq is the unit's interpreter and local fixer. Nobody knows his last name - and they're not even sure he's actually called Faruq.
Towerblock (Series 2-3)
aka: Gordon House Played by: Matthew Lewis
Nick's new number 2 knows his stuff and isn't afraid to say so.
Ellen Best (Series 3)
Played by: Laura Aikman
Ellen Best is a high-threat-bomb disposal expert who couldn't be less like the rest of the unit if she tried.
Mary (Series 1-2)
aka: Rev (Major) Mary Greenstock Played by: Kelly Adams
Mary is the padre who is desperate to do a good job, fit in and keep up with the banter, but is pretty sure she's failing at every turn. She's actually doing fine, although no-one's going to tell her that.
Millsy (Series 1)
aka: Corporal Christian Mills Played by: Gary Carr
Corporal Christian Mills (aka Millsy) was Nick's Number Two - his right hand man.