Read this from the USNI.org site
Quote:
Originally Posted by http://www.usni.org/resources/LAclass/ssnlaclass.htm
SSN 768 and later have improved sound quieting and improved propulsion systems. Several late units (including SSN 773) have shrouded pump-jet propellers.
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http://www.usni.org/resources/LAclass/ssnlaclass.htm
That's a interesting mental image... an LA with a pumpjet propulsor.... oooo I want one.