How are American non-denominational campus outreach lay ministries conducted?

How are American non-denominational campus outreach lay ministries conducted? I think the purpose is either to serve the greater community's needs as a form of community service or to convert people to Christianity or to serve the greater community's needs as a form of community service, which can attract people into Christianity (aka convert to Christianity). What I wish to know is whether or not it is more community service or more proselytism/Christian education. What roles do clergy and laity play in this sort of ministry? How can a non-denominational lay ministry cater to Catholic students who may believe in the importance of the clergy in educating the populace about Christian history, doctrine, and practice, or are these ministries interested in proselytizing Catholics and Orthodox Christians to Evangelical Protestantism?