Guest Stars Michelle Lukes as Sgt Julia Richmond Rhashan Stone as Maj Oliver Sinclair Liam Garrigan as Sergeant Liam Baxter Shane Taylor as Craig Hanson Natalie Becker as Jessica Kohl Lyne Renée as Rebecca Levi Olivia Grant as Ava Knox Nick Reding as Joseph Dreyer Erica Wessels as Melissa Lombard Conrad Kemp as Lab Technician Matthew Nel as Harry Lombard