(02.10.) Foreign fighters man checkpoints, serve as commanders on the battlefield and have become the de facto rulers of towns and cities in areas under rebel control, giving them a visible and much-feared presence across large swaths of territory, according to Syrians living in the north as well as analysts. Saudis, Tunisians and Libyans are among the most frequently encountered nationalities, the residents and analysts say, but men from Chechnya, Kuwait, Jordan, Iraq and the United Arab Emirates also are present.