Wow people are pretty quick to pounce here... who cares about what a profile says...
I wouldnt be suprised if he did, or someone somewhere in the Canadian Military did. My 1st tour to Bosnia we had a "fun day" at the ranges. People were firing two 9mm at once, 1 handed rambo style C9.... Yeah yeah you can chant safety till the cows come home but we did it and lived. Not everything happens on a strictly controlled range!
Some have and more will say firing from the shoulder is wildly inaccurate which is true... but think a different way... The more ways you can make to fire a gun the more situations it can be used it. You never know when you may need to fire it from the shoulder, can you really say would never be an opportune moment for it? Hell, who knows for sure!
Its obvious why we dont have a front hand grip though, we just dont train that way.