In many ways Tolkien partakes of a certain Edwardian (if not Victorian) attitude towards military pursuits, so it is quite possibly a cultural value he demonstrates.
This Edwardian trait is not represented in this war memorial, the very beautiful and very moving memorial to the Canadian dead at Vimy Ridge:
Walter Allwards' Stone Memorial at Vimy. See this multimedia version:
Experience Vimy
Rather, Tolkien's depiction of war more closely resembles the kind of heroic stance represented by these statues:
Marshall Foch in London:
(This one is rather different from the statue over his tomb at Les Invalides in Paris, so I am assuming it represents a British style of war memorial.)
Wellington in Hyde Park, London:
Edward VII in Queen's Park, Toronto, transplanted from Delhi, India and so representative of the colonial or empire style; note that he is not here given his nick name of endearment, Tum Tum:
I am allowed but three images per post, so I cannot show any more to exemplify the idea that Tolkien participates not just in a heroic style from ancient epics but also in what was for him a contemporary cultural preference. (For instance, the statue of Wellington on horseback in Glasgow, which was initially presented as one of these heroic equestrian models, now sports, with civic acceptance, a traffic cone on Wellington's head. This is a particularly Scottish response which does not seem in keeping with Tolkien's war model; nor is it emulated south of Hadrian's Wall.)
We can imagine a Middle earth war memorial to the War of the Ring in this style which would display Gandalf astride Shadowfax rather than a sorrowing figure of a woman mourning her war dead.
(btw, I would swear I received a notification of post #52 in which it was attributed to Lalwende rather than davem. *insert kindly smile here* )