Riiiiight at the end we get a tiny bit of “oorah” when his dad shows up, and even then it’s mostly just like “nice, welcome to the club, Dad.”

Remember, everyone told him signing up for service was a dumb idea, and everyone in the service told him trying to become infantry was a dumb idea. His experiences don’t exactly prove them wrong.

This is all within the context of the whole movie we’ve been watching up to this point being an in universe propaganda film

His family and everyone around him only were against him joining so him joining could be framed as rebellious within the propaganda