Clarification.

• Position: Correction notice

In the March 2007 Defense Watch column ("A Navy With Fewer Carriers No Longer Unthinkable") it was reported that Navy aircraft carriers cost nearly $10 billion apiece to build.

According to the Naval Sea Systems Command, the lead ship of the new class of aircraft carriers, the CVN-78, is estimated to cost $8.1 billion. Follow-on ships are estimated to cost $7.6 billion (in...