  The Super Bowl champion Baltimore Ravens aren't going to
relive last season at training camp this summer. The first full-
squad practice Thursday will mark the beginning of a renewed
quest for greatness, making the Ravens vastly similar to each of
the other 31 NFL teams.  "To me, it feels like we're working to
get a Super Bowl, because there are a lot of new people, a lot
of new faces," offensive tackle Bryant McKinnie said. "The
chemistry has to grow with all the new people and everything.
Different people have to play different roles this year, as far
as stepping up and becoming leaders."  This team has undergone a
vast makeover in the months since Baltimore defeated San
Francisco 34-31 in the Super Bowl.  The retirement of linebacker
Ray Lewis, the trade of wide receiver Anquan Boldin and the loss
of free agents Ed Reed, Paul Kruger, Cary Williams, Bernard
Pollard and Vonta Leach means Ravens will defending their title
with an altered cast of characters.  Five things to know as the
Ravens open camp:  1. M