75 years since NATO was created to defend Europe, Sitrep asks what’s needed to do that job properly today.

From organising hundreds of thousands of troops, to digging ditches and ensuring bridges can carry tanks, the challenges are explained by Professor Michael Clarke and Oana Lungescu, a former senior advisor to the NATO Secretary General.

Part of the jigsaw is the new Alliance Reaction Force. It’s commander, Lieutenant General Lorenzo D’Addario tells Sitrep how the ARF plans to pack more punch more quickly.

And former Royal Navy Commander chooses his ‘moment that made me’, when an engineering mistake flooded his ship and threatened to sink it.