A better second Ref. from NAVWEASYSCOM one above was broke when I checked and of course the edit clock ran out on me. To my UK friends I apologize, that would correctly be the
TYPE 45 Destroyers, I have both known and worked with members mostly of the Submarine community and I have a deep respect for their character and professionalism. And I learned that beyond "social" drinking to
never challenge them to "drinking games/or contests" even at their invitation

!
http://www.navweaps.com/Weapons/WNUS_5-62_mk45.htm
Again links highlighted.
Regards,
Pat
