Jack O'Connell as Gary Hook

Sean Harris as Captain Sandy Browning

Paul Anderson as Sergeant Leslie Lewis

Sam Reid as Lt. Armitage

Sam Hazeldine as C.O.

Barry Keoghan as Sean Bannon

Charlie Murphy as Brigid

Richard Dormer as Eamon

Killian Scott as Quinn

Babou Ceesay as Corporal

David Wilmot as Boyle

Martin McCann as Paul Haggerty

Jack Lowden as Thommo

Valene Kane as Orla

Adam Nagaitis as Jimmy

Joshua Hill as Carl

Barry Barnes as Jake Fullarton

Aaron Monaghan as McCann

Liam McMahon as O'Brien

Paul Popplewell as Training Corporal

Jim Sturgeon as Sergeant John Vickers

Denise Gough as Lillian Hughes

Dawn Bradfield as Sean's Mum

Eabha MacCabe as Sean's Little Sister

Paul Kennedy as Johnny

Ben Peel as Ruc Man

Jonah Russell as Barracks Officer

Gerard Jordan as Huge Man

Amy Molloy as Mother in Raided House

Corey McKinley as Loyalist Child

Chris Patrick-Simpson as Older Loyalist

Cathy White as Good Samaritan

Emmet Kirwan as Gang Member

Tom Cowling as Large Soldier

Aaron Lynch as Young Boy at Riot

Andy Moore as RUC Man

Peter McNeil O'Connor as Warden

Harry Verity as Darren

Ben Williams-Lee as Recruitment Soldier

Terence Keeley as Younger Loyalist Man