Change US to WEST, and RU to EAST, as direct references to the realistic Western and Eastern political spheres of influence.
This also provides perfect justification for implementing European/NATO uniforms to the WEST team, and Balkan/Chinese/Middle-Eastern uniforms to the EAST team.
It also justifies the unrealistic arsenal that is already in the game, and can be expanded with weapons that the current factions wouldn't really have access to outside of a global war (Chinese weapons for example).
This is purely a cosmetic change, and shouldn't affect gameplay, adding a touch of realism and lore to the game.

