This year Foundation Beyond Belief (FBB) is sponsoring the Pathfinders Project, a year-long volunteer journey, taking four humanist volunteers across the world to work in education, clean water, human rights and construction projects, and to evaluate programs for inclusion in a future Humanist Service Corps (HSC). The HSC will be a proud moment for all nonbelievers. Like the Peace Corps, the HSC will serve their fellowman in the cause of peace by living and working in developing countries, but with more focus on encouraging and demonstrating the generosity and compassion of secular humanists.
This is like Missionaries but it is secular, and run by the Foundation Beyond Belief. This is the web site. Below is a video describing the effort and some information from a press release: