As you can see there is a mix of weaponery in them, that is just for coolness sake :) .
There are a pair of troopers, one with a chainsword and plasma pistol and the other with a pow fist and a bolt pistol.
And their backpacks, which are from the BA sprue but are completed with some etched brass.
Detail of the pow fist guy.
This is another trooper, I cannot put photos of the fourth one because the internet ate them.
This guy has his arm converted, just to put him in a more dynamic position.
Next: Another trooper, the sarge and the whole squad.