That seems to be very Regional, I remember ATF blathering on about that when Mitch was present but if I recall it was only for when the room was full of Commissioned Officers. (We used Room Shun on my SSIC and then Ladies & Gens on OIC, O wasn’t paying attention at the SCC so can’t remember what we did then).
Ditto - one of my cadets has joined a military college where they call all instructors Staff. Tried it on me once. Didn’t again. 
I’m northern, a simple “How do,” will suffice.
And then compare your whippet
Don’t want to get in trouble like this chap…
How has this topic generated over 80 replies…?
50 of which are off.topic 
You must be new here.
It’s what we do
I’d have expected SL Bloggs to be a Jo rather than a Joe in that situation
Little Mix if addressing a new officer?
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Trying to think of the film - new officer addresses his troops “Good morning gentlemen,” and proceeds to brief them. Later taken aside by his CoC - “First of all, they are NOT gentlemen, they are soldiers”. Can’t remember the actual word he used instead of soldiers, it could have been sappers, commandos or troopers etc, could even have been airmen!. Times have changed lol
I don’t think I’d say it is common practice. The most common I hear is “room shun” (and I hate it).
For me, I’ve only ever used “Ladies & Gentlemen” to alert a room full of fellow ladies & gentlemen i.e. Officers/WO/SNCOs. I’ve never used it for cadets. “Sit up!” is my go-to in that situation.
But indeed, a rethink for a room of CFAVs will be in order.
Agree with this, never heard it done any other way…
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God I feel old, I have heard it all the ways described above……
Room, room shun, ladies and gentlemen
But my favourite was……“quick there here!”
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Those of us older still remember the simplest option: “Atten-tion!”
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Wow, so sounds soo old hat now.
‘Oi, Wake up’ that worked during basic.
We’ll need a tweaked format for the Loyal Toast too…
‘Everybody in the house, toast the …’
“esteemed guests and colleagues…”?
I don’t identify as esteemed 
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