This is a GAHC (Ground,Air,High Command) cavalry trooper.

The GAHC cavalry have two different main roles. They are sent in along with rangers first into a battlefield to secure landing zones for the main force. They are light infantry so their second role is to try to outflank an enemy force while regular army units hold the enemy in place.

They where goggles and a scarf to keep dust from getting in their face (from rotor wash).