IMO it's a genre thing, there are tons of novels of WW2 male experiences, but THESE books seem to be in the genre of women's fiction
women's fiction taking place during WW2 is still women's fiction, so it has to be marketed to that readership
(military fiction is often marketed to men)
I don't like these covers either- don't we have enough faceless women?- but apparently they've figured out that their readers respond to this kind of image