A group in uniform marches carrying red signs with Chinese lettering on them.
a militant Chinese group lead a protest with red signs
Not all groups in uniform are militant groups. Just because the group is carrying signs doesn't mean they are protesting.
A marching group might not be militant, and non-Chinese people might use Chinese writing.
The group in uniform doesn't have to be militant, it could be a peaceful group of students for example. Also just because their signs have Chinese lettering on them, they do not have to be currently in China to have them. Also, we don't know that the reason the group is carrying signs is in order to lead a protest.