UNITED NEWS INTERNATIONAL (UNI) — In the wake of an alleged chemical weapons attack in Syria and a retaliatory airstrike by the West, thousands of U.S. troops have landed in Jordan for a major training exercise.

The drill, known as Eager Lion, kicked off on April 15, a day after the U.S., France and Britain launched missiles at Syrian military targets in response to an alleged chemical weapons attack near Damascus.

Throughout the 12-day military exercise, U.S. and Jordanian troops will train for scenarios ranging from border security to counterterrorism.

For the first time, the drill will also include a simulated chemical incident.

Nearly 3,600 U.S. troops will participate in this year’s Eager Lion drill.

Now in its eighth year, Eager Lion has repeatedly been condemned by Syria and Iran, who call it a practice for an invasion of Syria.