Jet pilot Jake of 9 Squadron heads for NATO's front line to face off against three Russian jets. And rookie Harry bids to earn his wings and qualify for full operations.
Jet pilot Ben faces a life-or-death decision over Syria. And RAF Lossiemouth's station warrant officer prepares for one of the biggest events on the military calendar.
The new surveillance team go into action when a Russian warship is spotted close to the UK's vital pipelines. And a regiment gunner heads for the front line for the first time.
High over Syria, young pilot Buzz encounters a Russian aircraft just as his wingman suffers a cockpit emergency. In Estonia, a broken jet risks leaving NATO's frontline undefended.
On base, both Jim and Dave have made big plans. But breaking news puts everything on hold.
