On the "U_B_CombatUniform_mcam" and "U_B_CombatUniform_mcam_vest" is a US-Flag in the specular map (vests_smdi.paa).
If you want to use the "hiddenSelectionsTextures" for customizing, it looks a bit strange. ;-)
I think this is just a left-over which needs to cleaned up.
Thx!
{F21250} {F21251}