Six birds went into the valley. One landed. Clear each chapter to unlock the next, with Reyes and Okafor covering your six.
This browser would not start 3D graphics, so the game cannot run here. Close the browser fully and open it again (on an Xbox: Xbox button, highlight Edge, Menu, Quit), use a normal window instead of InPrivate, and check that "Use graphics acceleration when available" is on in the browser's settings (System and performance).
A private military company called the Meridian Group has taken the Calder Valley. They hold the town of Harrow's Reach, the dam above it and the only radio relay in or out. Four thousand people are trapped behind the snow.
Operation SIXFALL sent six helicopters in at night to take it back. Five were shot down on the way in. One landed.
Yours. Callsign Six, with Reyes and Okafor. Command's last order before the radio died: hold until we can reach you, and cover each other's six.
The browser stopped the 3D graphics, usually because it ran out of graphics memory. Reload to carry on with lighter graphics.