Yeah they wore this on their helmets.
It was required for the week they honored Sean Taylor. After that, teams had the option of taking the decal off or keeping it on. Some took it off. Some didn't. Seahawks didn't take it off.
BUT.
The Redskins were the only ones with the 21 patch.
My opinion? The Gene Upshaw patch should be a decal on the helmet. And if any team is wearing it as a patch, it should be Oakland, and only Oakland.