 Sixty concrete revetments were constructed to protect aircraft from another attack , and the Navy laid down a 16 @-@ inch ( 410 mm ) water main from across the harbor . A new control tower was commissioned on May 1 , 1942 , and the Navy built bomb shelters and gas @-@ decontamination chambers . Due to the need for better control of the US Pacific Fleet , its headquarters moved to Ford Island . 
