From Blatch:

"Leaving the job, he said, is akin to the pain of 'a sucking chest wound.'
"Can you imagine anyone but a Newfoundlander - and a soldier - putting it like that? "

Actually, I think I can narrow it down even further. I'm pretty sure it'd have to be a Newfoundlander and a soldier with limited personal experience of sucking chest wounds. General Hillier was at the big CTV party near the Hill yesterday,  and offhand I don't believe I spotted any other trauma cases there.