The fire is the fourth to break out on a Navy ship in recent months.
The agency also found poor communication between the bridge and combat information center contributed to the accident.
The Navy has recovered a $2 million anti-mine pod dropped by one of its helicopters this month off the coast of Virginia.
Damage on some decks spanned the length of the 844-foot ship and reached 106-foot-high ceilings, the CNO said.
Chief of Naval Operations Adm. Mike Gilday said the Navy is launching three investigations into the ship's fire.
Firefighters have extinguished blazes on the Navy amphibious assault ship Bonhomme Richard after four-plus days of efforts.
Forty sailors and 23 civilians have been hurt battling the blaze on the amphibious assault ship Bonhomme Richard.
Hundreds of Navy and other federal firefighters have been fighting for days to put out the blaze.
The sailor was a second-class petty officer, according to data from the Naval Safety Center, which tracks mishaps at sea
Lt. Natalie Combs was censured in April for failure to perform her duties.
Maj. Gen. John Richardson IV has launched a yearlong effort to heal the base's deeply scarred image.
Congressman Dan Crenshaw is a former Navy SEAL and the headliner in one of the most hyped-up joint campaign ads ever.
You may soon be able to pick up your prescriptions at the commissary or exchange without waiting in line.
The Marine Corps is considering a plan in which it could funnel all recruits to a new base.
The mere possibility of the Marine Corps shaking up where it trains new recruits has drawn swift backlash.