The U.S. has a military presence in several key locations, but there are two areas with heavy U.S. troop presence that are being transformed to military bases, according to a military source: The first is located in Al Tabaqah near Al Raqqa north Syria, where the U.S. special forces troops are training Kurdish groups; the other is constructed in Al-Tanf where the U.S. troops prevent Syrian and Russian armed forces from crossing.”