The line from "The Flag Goes By" that supports the ideas in the last paragraph of "A Memorial Vision" is:
"But more than the flag is passing by."
This line resonates with the themes of remembrance and honoring sacrifices, which are present in the final paragraph of "A Memorial Vision" that reflects on the Vietnam Veterans Memorial as a tribute to those who made the ultimate sacrifice. Both texts emphasize the deeper significance behind the symbols of patriotism, portraying the flag as not just a material object, but as a representation of honor, sacrifice, and the collective memory of those who defended freedom.