The winning army does not need pass on their genetics personally, only that the nation that produced the army survives to pass on their culture and genetics. The genetic difference between a brave soldier and his siblings is slight, and the cultural difference is zero. So if the soldier dies but most of their kin survives, by proxy they will pass on 99.999% of their genetics and 100% of their culture.
The left likes to promote Darwin's theory of natural selection, but they suppress Darwin's ideas in The Descent of Man, written in 1871. Darwin explained that human evolution is warfare based. To be human means to be a war maker. He explained how altruistic acts by soldiers are passed on, even if the soldier dies.
Darwin focused on genetics, however cultural evolution is more important for humans. If you let a small child grow up in the wild by itself, it will turn into a wild animal. It is the cultural programming we receive from our tribe that turns us into who we become.
"cultural evolution is more important for humans"
Then how do we explain these Communist-loving liberals who want to destroy our country?
Darwin didn't talk about genetics. Genetics weren't incorporated into Darwinian theory until the Modern Synthesis in the 1930s and 40s.
Peter Singer says replace the ideas of Marx with the ideas of Darwin? Is that an improvement?
http://www.reason.com/0012/rb.the.shtml