Someone else mentioned a few of the costs not taken into account, such as the Navy needing to spend money they didn't initially plan on spending so the heat of

Someone else mentioned a few of the costs not taken into account, such as the Navy needing to spend money they didn't initially plan on spending so the heat of the F-35B doesn't damage the flight deck of the amphib ships. Those had been built to expect the heat of the A/V-8B which is significantly less than what comes out of the tailpipe of the F-35.