The best thing about sports is the sense of community that it creates. In the ball park, fans wearing jerseys and other memorabilia creating a sense of unity. From ooohing and ahhing at the various developments on the field to collective chants, being at the ballpark/stadium is a very unique experience.
When something as intimate a proposal or a soldier returning home from war happens in on the field, this sense of community is heightened and overwhelmingly emotional. I won’t spoil the exact details for you, but getting teary-eyed while watching this video is no crime.