$12.9 billion warship, the USS Gerald R. Ford, is not ready for combat, the Department of Defense says

The massive 'supercarrier' is the most expensive Navy warship ever built and is due to be commissioned this year

The ship delivery is scheduled for November, more than two years late of its original date of September 2014 

A government memo says 'poor or unknown reliability issues' are behind the latest roll out problems with the ship