As a result of the lessons learned from the Battle of Midway in June , the ships ' fighter complement was strengthened to 21 Zeros .
The other aircraft reduced to 12 D3As and 9 B5Ns .
As a result of the lessons learned from the Battle of Midway in June , the ships ' fighter complement was strengthened to 21 Zeros , and the other aircraft reduced to 12 D3As and 9 B5Ns .