The units' levels may vary, meaning that you might have units level 11 and 12 together.
However, the maximum badge level is 16, and upon reaching this level, all of the military officer units will reach level 12.
- As for increasing the number of units accompanying the military officer, it is solely linked to the officer's level. Upon reaching officer level 50, you will have reached the maximum number of units, and they will not increase beyond level 50.