"It looks like Mr Majied was on the US Carrituck."
Here's a webpage that lists the command orders for the Vietnam carriers... Don't see mention of the USS Currituck there.
http://www.history.navy.mil/branches/ordbat.htm
Master Chief Master at Arms, an E-9, which is the highest enlisted rating. He would have needed to enter the Navy at least 15 years earlier (probably more) to be that senior.
"He served 30 years between 1963-1966 and fought in Vietnam alone?"
He was claiming he was on the Currituck for three years, 63-66.
The USS Currituck (AV-7) was a seaplane tender, not a carrier.
Now can we find someone else who was on the Currituck, or a cruise book from that time, and look for the name of the Master Chief Master at Arms?