This title is not pertaining to the river that flows through my town, nor is it a metaphor for Guinness ™ both of which are tranquilly intoxicating.
No, unfortunately, this is the mercenary army proposal of Donald Trump, just like the Légion étrangère in France.
The French Foreign Legion is composed of 100% foreigners, usually criminals, ex convicts and psychopaths, just like the Black & Tans (Brits in Ireland).