I noticed the Veterans of Osgiliath do not have the shieldwall rule, meaning they could even be considered equal to the point cheaper warrior of Minas Tirith... Was this a typo?

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By all that you hold dear on this good Earth,
I bid you stand, men of the West!

No. Not for Numenoreans either. But of a shame but hey ho. Thems the rules

I mean, Numenoreans do not have heavy armour, so makes sense. But Osgiliath Vets? Really? Is there an official place where I can submit this quastion to be answered? May have been an oversight.

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By all that you hold dear on this good Earth,
I bid you stand, men of the West!

I think this is more to represent the way in which they fight. Sure you could claim that since they are still warriors of Minas Tirith that they would still know the skill but the profile represents them fighting as a skirmish formation; holding the streets and shores of Osgiliath where a shieldwall may not be able to be formed.

My thoughts as well, based on what we see on the films

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Soon Master Elf, you will enjoy the fabled hospitality of the Dwarves! Roaring fires, malt beer, red meat off the bone!

The vets do have +1 courage than the warriors to compensate (somewhat).