Another point of accuracy, two of the medal ribbons worn by the incoming and outgoing Captains do not seem to match the period. In the scene of the farewell party they seem to be wearing the same medal ribbons but in reverse order. The left hand ribbon is possibly a GSM (1918) i.e. pre 1962 GSM and could indicate service in Malaya or Cyprus which does match. The right hand ribbon looks to be the UN Korea Medal (1950-1954). However the middle ribbon looks like the Queen's Diamond Jubilee Medal? Surely not.