Hemingway’s hint of “home” compared to war culture?

“He was feeling exalted and talkative as football players are in the dressing room after a game.”

Hemingway, Ernest. In Our Time. New York: Scribner Paperback Fiction, 1958. p18.

I thought that this comparison with the football players was very odd. It did not fit into the context of what seemed to be a very serious, warlike environment. Did Hemingway use this specific comparison to show how the people who were witnessing and experiencing war were regular people who used to be in the “football” culture back at home?