Frightening attrition of missionaries permanently coming off the field highlight this key to effectiveness: stay on the field! Life on the mission field is tough. Longevity and staying power are key to fruitfulness. There are ways we can help enable this key, through doing our part as sending and through encouraging our missionaries to do their part to trust God through the suffering and challenges to be durable, have the stamina it takes for the long haul. Propempo helps senders, churches, and missionaries do what it takes to make longevity a reality, by God's grace and for His glory.