I have only played two games of Imperial Assault and only one using this list, but the Winter Tournament is set for this weekend and I was looking for some advice.
Kayn Somos
Elite Stormtrooper
Stormtrooper
Stormtrooper
Heavy Stormtrooper
Imperial Officer
I was pretty successful at mixing the troopers up so that a defeat at any one terminal didn't wipe out an entire group. I was also able to deal an impressive amount of damage using Kayn Somos and the heavies for firing squad.
My command deck is
Take Initiative
Reinforcements
Reinforcements
Strength in Numbers
Squad Swarm
Cruel Strike
To the Limit
Lock On
New Orders
Rally the Troops
Planning
Set for Stun
Expose Weakness
Against the Odds
Celebration
I threw this together real quick before the game with the aim of maximizing my activations at any point to focus fire or outnumber my opponent. Really just trying to get there the "firstest with the mostest" or at least close to first with enough guns to blast the first guy.