The Pittsburgh Steelers let me down with the flag protest

Chisel it in stone: the Pittsburgh Steelers have rejected the national anthem - a song of allegiance - of the United States of America.

Which flag do they salute?

As a veteran of WWII and the Korean conflict - and as a formerly-staunch Pittsburgh Steelers fan, I am deeply incensed and deem it un-American to support those engaged in anti-American activity.