THE ARM THAT HAS THAT FLAG IS THE COMBAT PATCH
That Is Not The Soldier Sleeve Insignia [SSI] Unit Patch
>Soldier Sleeve Insignia
>Soldier Sleeve Insignia
https://en.wikipedia.org/wiki/Shoulder_sleeve_insignia_(United_States_Army)
https://en.wikipedia.org/wiki/86th_Infantry_Brigade_Combat_Team
one of the lead units for current DC mission