Just watching the NY Red Bulls vs Arsenal game and I notice the ARs are using the English Touchline flags rather than the usual Ervocom or OSI flags I normally see in MLS games. Presumably Arsenal haven't just brought a set of referees flags with them and told the ref to use them, so have I missed something and has Walton used his influence to introduce the good old quarter + plain flag system to America?
I think the crew was from Puerto Rico (at least the referee was) so maybe that's what the use down there?
Off topic trivia: Prior to 1990 this was in Law VI: "The linesmen should be equipped with flags by the club on whose ground the match is played."