en_tn/num/02/17.md

the tent of meeting must go out ... in the middle of all the camps

This means that the tent of meeting must be carried by the Levites in the middle of the tribes as they travel.

They must go out

"They" refers to the twelve tribes.

by his banner

Each man does not have his own personal banner; rather, this refers to the banner belonging to his tribe. Alternate translation: "by his tribe's banner" (See: rc://en/ta/man/jit/figs-synecdoche)