People keep comparing this film with "A Fairwell To Arms" (1932). If that is true, then it can also be seen as a stepping stone to "The Americanization of Emily" (1964) — highlighting how changing American attitudes toward war have become gradually more cynical.
Seems like the "Emily" team — writers and director — might have been influenced by Sgt. Joe 'Pete' Peterson (Holden character), transposing Garner's Charlie Madison to be an updated version of same. 1932 > 1951 > 1964.
All three successfully integrate Romance and War, ably supporting the theme that Love is the stronger force. So why do we keep on making war?