I could be nit-picky and point out that Londo led Centauri forces in the raid on Vallus 12, according to "Voice in the Wilderness"... but, yeah, he's clearly not a 'war hero' in the same way Sheridan or No.1 are, even if he does have some minor combat experience in his background.

We really don't know anything about the Centauri military, do we?

It's funny - it didn't occur to me until just now that the Minbari castes are the idealised division of medieval society - Those Who Pray, Those Who Fight, and Those Who Work. B5, it seems, sides with the Papacy over the Holy Roman Emperor in regards to who has supremacy out of the first two...