I bet people who were around during World War II would say this song sums up many of the emotions of those times, especially when things looked bleakest. The song was famously featured in the last scene of Stanley Kubrick’s Dr. Strangelove. It would be interesting to find out how Dame Vera Lynn–who is very much alive–feels about that.
Wikipedia says that in 2009 Lynn, then 92, became the oldest person to reach number one on the charts in England with We’ll Meet Again: The Very Best of Vera Lynn. The song was one of the last–if not the very last–recorded by Johnny Cash.