Hah, I kept thinking that ES was the country code for Spain (Espaņa). I think in a place like El Salvador, it's probably all over the news that he was going to be in town, so if you didn't figure it out from one of the security guys, you would have found out from someone else. Kind of like if you know the president is in town and you suddenly see a limo being escorted by 50 cop cars.