With the Wagner Group, the paramilitary outfit run by "Putin's Chef", making headlines over its role in the Ukraine conflict, this week we take a look at the world of  mercenaries. The commodification of war is a growth industry and it turns out hiring armies is more the historical norm. What does this mean for national militaries moving forward? Who are the big players and where can they be found? And why didn't David ever get recruited into the world of corporate espionage? Make sure you're locked and loaded for this one!

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