Which accomplishment did william darby have in world war ll? shot down more than 20 enemy planes rescued dozens during the attack on pearl harbor formed a battalion of army rangers flew his plane into a japanese ship

he formed a battalion of Rangers known as "Darbys Rangers", which eventually evolved into the Army Rangers.

(Technically the answer is wrong because Darbys Rangers came before, and where the bedrock for the Army Rangers)

Explanation:

i believe that the answer to the question provided above is that  establishing smaller ethnic communities within larger communities  gives more chance for people to know each other more but this might lead to the  conflict between groups.