And the sense of loss if very prevalent in a lot of WW2 songs, like

I'LL BE SEEING YOU
words by Irving Kahal, music by Sammy Fain, ©1938,

Cathedral bells were tolling and our hearts sang on;
Was it the spell of Paris or the April dawn?
Who knows if we shall meet again?
But when the morning chimes ring sweet again...

I'll be seeing you in all the old familiar places
That this heart of mine embraces all day through
In that small cafe, the park across the way
The children's carousel, the chestnut tree, the wishing well.

I'll be seeing you in every lovely summer's day
In everything that's light and gay
I'll always think of you that way
i'll find you in the morning sun
And when the night is new
I'll be looking at the moon
But I'll be seeing you.