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I have heard that Ultramar have a large PDF and contribute to the guard, but what about other worlds, EG Nocturne?
Would that be possible?

I'm fairly certain that Ultramar is unique in that regard, aside from fanfiction chapters.

Note that Ultramar itself is somewhat unusual; most space marine homeworlds (where they have one) tend to be feral worlds or death worlds from whence the marines can draw a suitably 'toughned up' populace. Such worlds won't maintain a formal PDF and tend to be 'aptus non' tithe grade - i.e. left as 'hands off' by the Administratum. Baal and Fenris are good examples.

There will be other exceptions. Any homeworld that's also a hiveworld (for example Kiavahr, the hive world orbited by the Raven Guard's homeworld of Deliverence) will have a formal PDF so will probably raise guard regiments when required.

locarno24 wrote:
Note that Ultramar itself is somewhat unusual; most space marine homeworlds (where they have one) tend to be feral worlds or death worlds from whence the marines can draw a suitably 'toughned up' populace. Such worlds won't maintain a formal PDF and tend to be 'aptus non' tithe grade - i.e. left as 'hands off' by the Administratum. Baal and Fenris are good examples.

There will be other exceptions. Any homeworld that's also a hiveworld (for example Kiavahr, the hive world orbited by the Raven Guard's homeworld of Deliverence) will have a formal PDF so will probably raise guard regiments when required.

actually the raising of guard regiments is NEVER required. a space marine homeworld is, by virtue of being a space marine homeworld, exempt from tithes. (presumably supporting the chapter is seen as their tithe) thing is, because of that, you can bet it's extremely rare for a SM chapter to be gifted a world deemed of much value. so Ultramar is proably "near unique" in that regard. as the IoM isn't going to want to surrender a important world when a undeveloped feral world is just as good. Tradition also seems to hold that feral worlds provide the best recruiting stock. although the Ultramarines prove that tradition to be false.

Not required to have a PDF force but most of them have . For example the crimson fists homeworld , Rynn's world have their own Rynn'sguard

Big galaxy. Anything is possible if you want it to be for your own fluff.

I concur with the comments about Baal, and BrianDavion (Mechwarrior fan?) has the fundamentals right. But anything is possible with 1000+/- Space Marine chapters spread across the Milky Way.

In my own fluff my Space Marines carry the lineage and honors of an Imperial Army Regiment, but the actual Regiment also still exists. The Regiment considers itself the Auxilia for the chapter, yet the chapter regards the Regiment as it's 'senior' in honor and lineage. Their customs and traditions are curiously intertwined. They're in a sector frequently cut off from the rest of the Imperium by warp storms, so the sector has de facto become a bit like the Realm of Ultramar - a loyalist pocket empire, albeit one that is forced to go it alone against various invaders for much of it's history, and rarely able to go over to the offensive.

So yeah, anything is possible if you think it through and justify it well.

My two teef.

According to the 6e C:SM, no Space Marine home worlds are required to provide Imperial Guard regiments.

Most worlds in the Imperium are obliged to provide regiments for the Imperial Guard when required, but Space Marine home worlds are an exception.
-- Codex: Space Marines. "Ultramar". p23. print

That is not to say SM homeworlds cannot raise their own regiments. In the same codex it is explicitly said that each world of Ultramar raise their own PDF regiments for defense, and such regiments are ready to join the IG when need be.

So it's just a matter of if a Space Marine Chapter has the spare resource to raise additional PDF forces AND are willing to send them to join the Imperial Guards.

 lcmiracle wrote:
According to the 6e C:SM, no Space Marine home worlds are required to provide Imperial Guard regiments.

That goes only for worlds actually ruled by a Chapter. Those who are able, like the Ultramarines, will probably raise PDF and maybe even provide volunteer regiments for the Imperial Guard. It makes their own fight easier so the marines can focus on bigger problems. But most marine homeworlds are so low-tech and sparsely populated that they can't raise troops even if they wanted to. Makes sense - a Chapter feeling rebellious will have to go it on their own without any IG equivalent support loyal to them.

Many Chapters are also spacebound or otherwise without a home world. These will usually have recruitment rights on certain worlds but no authority to say what these planets provide for the IoM.

Spetulhu wrote:

 lcmiracle wrote:
According to the 6e C:SM, no Space Marine home worlds are required to provide Imperial Guard regiments.

That goes only for worlds actually ruled by a Chapter. Those who are able, like the Ultramarines, will probably raise PDF and maybe even provide volunteer regiments for the Imperial Guard. It makes their own fight easier so the marines can focus on bigger problems. But most marine homeworlds are so low-tech and sparsely populated that they can't raise troops even if they wanted to. Makes sense - a Chapter feeling rebellious will have to go it on their own without any IG equivalent support loyal to them.

Many Chapters are also spacebound or otherwise without a home world. These will usually have recruitment rights on certain worlds but no authority to say what these planets provide for the IoM.

I thought that was my implication.
At any rate, I think you are correct about the "will do if capable" thing. The Ultramarines are an anomaly amongst the Space Marine Chapters, in that they are the only chapter that has multiple systems (let alone planets) under their direct control.

The area around Macragge is called Ultramar, the stellar empire of the Ultramarines, and is unique amongst the domains of the Space Marines. Where other Chapters rule over a single planet, asteroid or, in some cases, a mobile space fleet or orbital fortress, the Ultramarines reign as titular lords over no fewer than eight local systems.
-- Codex: Space Marines. "Ultramar". 6th Edition. p23

And also that

Ultramar's worlds do not pay the Imperium's tithes. Instead, they contribute directly toward the upkeep of the Ultramarines Chapter, supplying them with the raw materials, armaments and spacecraft needed to wage the Emperor's wars. -- "Ultramar"

The case of the Ultramarines is that they are simply able to do so. It might be a noble tribute to the Imperium, or a tradition kept from long ago. Either way they can afford to do so because they are simply have the resources to spare. Other chapters may not be so fortunate, though.

Warboss Gorhack wrote:
Big galaxy. Anything is possible if you want it to be for your own fluff.

I concur with the comments about Baal, and BrianDavion (Mechwarrior fan?) has the fundamentals right. But anything is possible with 1000+/- Space Marine chapters spread across the Milky Way.

agreed anything is possiable, it's just rare. Space Marines tend to perfer feral worlds. but that's likely because the IoM isn't terriably thrilled to surrender a useful tithe.

and yeah Mechwarrior fan (or was until I got tired of the setting radically changing every 6 months)

Specifically with Salamanders, am I correct that the SM s only rule the moon, not Nocturne, and so, would need to raise regiments?