In “its deepest intuitions,” Vatican II was a missionary council whose stated purpose was to renew the church spiritually and institutionally and so prepare the Catholic community to evangelize a changed, more complex world. Church leaders’ subsequent failure to correctly understand the council's biblically sourced, trinitarian view of mission's object, its method and agency, led to a failure to implement Vatican II's practical pastoral aims. Although the conciliar vision was committed to and embedded in the reformed liturgical rites where it continues to nourish and inspire Catholic life today, the absence of the institutional, ministerial supports needed to complete what the liturgy instills forever blocks achievement of the council's aims. The experience of the US church provides a ready example of how Vatican II's pastoral vision was waylaid and goes unrealized yet today.