Shemagh

The Shemagh is a headdress found to be worn typically by Arabians to be direct sunlight protectors and also to prevent sand/dust from going into one's eyes/mouth in some areas. The enemy NPCs in Fireteam wear them. Plus, if you and your team completes the game mode in Hard difficulty, they would be awarded the Shemagh, the one worn by nearly all the enemies.

This head gear would be sent as an automatic, temporary gift after finishing the match. It is given for one day, and has a pretty decent headshot protection.