I'd put my favorites as the 212th for the orange livery and awesome paratrooper gear, or the Clone Intelligence Units fielded personally by Palpatine in the gunmetal and purple armor.
We have arrived, and it is now that we perform our charge.
In fealty of the God Emperor (our undying lord) and by the grace of the Golden Throne,
I declare Exterminatus on the Imperial world of Typhon Primaris.
I hereby sign the death warrant of an entire world, and consign a million souls to oblivion.
May Imperial justice account in all balance
The Emperor protects.
-- Task force of the Ordo Malleus, immediately before carrying out Exterminatus on Typhon Primaris.
Thought for the day: It is better to die for the Emperor than to live for yourself.