The Elite Soldier outfit is a disguise that can be found in A Gilded Cage.
Worn by the members of Reza Zaydan's unit. With the disguise several restricted areas can be entered: The school building, the embassy’s parking garage including the escape tunnel and the ground floor of the embassy itself. The player still has to be careful while moving around the school and the embassy since several NPC can see through the disguise.
The Elite Soldier outfit appears in the following mission: