British and Irish leaders condemned the shootings of the two British soldiers, who were bound for Afghanistan.
In Northern Ireland, he 'failed' 700 times but ultimately secured a deal in 1998 after decades of hatred and violence.
But questions remain about next steps in the sexual-abuse crisis and outreach to young Catholics.
Preaching universal values at the UN, Benedict will urge followers to strengthen their Catholic identity.
The reconciliation marked by the deal signed 10 years ago today gets a $71 million boost.
Roman Catholics' altered wording of a missal widely offensive to Jews still takes 'conversionist' approach.