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My only real comment is that when equipping squads you want to think how their weapons will work together, like the scouts for example. Personally I think the heavy bolter would be a better choice as I imagine the squad will mostly be used against infantry, in which case I imagine the missile launcher will be less effective.

Likewise look at weapon ranges and try to equip squads with similar length weapons. Don't, for example give a squad a lascannon and a flamer, as they fit completely different roles and one would always be wasted during the shooting phase (I know you haven't done that here, just something to consider.)

I play IG personally so I'm not overly familiar with the Space Marine list, but following on from the above suggestions, I give my squads autocannons and grenade launchers as both work against light and medium infantry, and light vehicles so they don't get wasted.

I think that combat squading them like that is a good idea, the only issue is one of squad redundancy, i.e. how many casualties can a squad take before its effectiveness is hampered.

In your squad of 10 you can theoretically take 7 casualties before losing either the missile launcher, flamer or Sgt.

However in the squad of 5 you can only take 3 casualties before you lose the Sgt or Flamer. The second squad would need to be wiped out.

However, I imagine that in a 500pt game there will be less redundancy anyway, especially with more expensive troops like marines.

Hopefully this is of some use, I think that all in all it is a good list.