The lads on R. & R. - Bugis Street, Singapore? 
In the sense of letting the ferret out for a run?
Or the ferret getting a bloody nose? 
Exploring the dark recesses.
Ah! Tunnel rats!
Dead on!
Probably Navy lads.
Out of uniform, but otherwise a characteristic pose.
Too used to sunning themselves as they swan around the world. Also other issues related to sailors upon land after doing much the same at sea.
Infantry know not to expose themselves.
Not the Virgin Soldiers, then?
That’s probably the reason for sailors being known as ‘Jolly’ Jack Tars!