Rather than bursting in, all guns blazing (the expectation), we were assigned team leaders and first officers, and had to go in with some semblance of a plan (the reality).
Which meant assigning different roles and duties across the team. The short straw? Whoever got lumped with the shield. Throughout the day's many, unrelenting practice runs (the instructors seemed determined to whip us into shape through sheer repetition), we all had a go with the shield.
The bonuses of being 'shield guy' are; 1) You get to have a shield (handy when you're in the line of fire). 2) Erm, that's pretty much it…
On the downside, you've got an insanely heavy piece of kit to lug around (on top of your gun, ammo, and armour), and you'll be the first person entering every dangerous room while you're team mates use you for cover. And if you're using it at night-time, your already poor vision is reduced to zilch.