The context of the following conversation is Lee and his army comrades had been fighting a war and sadly some of their colleagues had died.  At the funeral Lee stood shoulder to shoulder with his colleagues.:
Lee says I can't believe they're all gone..
The friend responds I know. But its over now..
Lee responds John, Billy-Bob, half of my colleagues are.... dead.
The friend responds Its all part of war..
Lee responds These guys are the only ones left alive.
The friend responds Yes.. an we are grateful.