What are the motifs in War and Remembrance by Herman Wouk?

Love is a motif in the book. There are several couples in this story who fall in and out of love. Pug and Pam admit they are in love but at times worry it is an "illusion of war." They continue to run across each other at various times, but it is almost always by chance and they never seem to have time to spend together. Pamela, as she considers marrying Duncan, says she does not love her fiancé as she loves Pug, but that they work well together.