DEBKAfile’s military sources reveal that all the Syrian forces trained by the US to fight the Islamic State in southeastern Syria have pulled back to behind the Jordanian border. They include the Usus a-Sharqia and Martyr Ahmad al-Abdo Brigade militias, which were part of the Syrian Free Army (SFA). They have evacuated the Badia region of the Syrian Desert in the last few days and taken up new positions on the 55km line from the US Al-Tanf base inside the Syrian-Jordanian-Iraqi border triangle. This line of retreat was agreed in US-Russian negotiations that took place at the end of August in Amman, Jordan. The Syrian army and Hizballah have moved into the space left by the SFA withdrawal.