I can't remember which edition of figures these were, but they came with heads attached to the torso and gems on their aquila instead of skulls. The sergeant figure is a Dark Angels veteran sergeant figure.
My plan is to have three 5-men combat squads, each with a sergeant holding a close-combat weapon and a bolt-pistol, three troopers with bolters, and a trooper with a heavy weapon. The first squad has a heavy-bolter, here a bit I bought off ebay, so the parts don't really fit exactly. This is my favourite version of the heavy bolter.
I have painted them in Dark Angel green, and you may or may not be able to see that the arms of the heavy-bolter trooper is not an exact shade to the rest of his body. Still, it's close enough, given how more than a decade separates the two bottles of paint used.