AB Donavon [sic] was not allowed to leave the boat and visit his parents.
There are various explanations in the press, of which this is one, all of which have been denied by 'Navy sources'. The Times is reporting that AB Donovan was an aspiring rapper who fantasized about killing sprees, and used the 'rap' name Reggie Moondogg. No doubt this is largely embellished, but he seems an odd character to have on a submarine crew...