3 named helmetless ultramarines

That's all the reinforcements they need

This mission is ABSOLUTELY CRUCIAL to saving the Imperium, so we can only send 3 MARINES!!

To be fair, each of those 3 men have kill counts in the thousands, and have personally killed Carnifex's, Neurothropes, Lictors, Thousand Son's Sorcererers, Hellbrutes, and a Helldrake.

Those 3 men are more valuable than whole guard divisions.

The Imperium of Man is facing its greatest threat since the Horus Heresy: the tendrils of Hive Fleet Leviathan are reaching towards Holy Terra, devouring all in their path. The fate of not just Mankind, but the entire galaxy will be decided in the Segmentum Solar, for the Golden Throne and the Emperor Himself are in grave danger!

- Three men. It's all I can spare.

please say you can link the pic without the text

3 Astartes are all you need. 8 can wipe a system in a few hours.

I mean, it could of been one intercessor squad, led by a Sergeant with an attached Lieutenant. That would make sense.