Line of bright UFOs spotted in northern Iraq

On March 15, 2009, a witness was in Tikrit Air Academy (located in northern Iraq). Suddenly, he observed a straight line of unidentified flying objects in the sky. What is it?

Witness statement:

I was on COB Speicher [a US Army contingency operating base, ed.], Tikrit Iraq sitting outside. In an instant I observed a straight line of lights, evenly spaced, flashed 2 times at the same time. Like they were Christmas lights being switched on and off. They seemed to arc the curvature of the earth like a line of lights wrapped around a ball.

Photo: Tikrit Air Academy, Iraq (2005). [Wikimedia]