Water baptism by immersion is the mode administered by local congregations, but they may receive on confession of faith persons who have been baptized by other modes. Those baptized as infants must receive baptism from a local Mennonite Brethren congregation on their profession of faith. Believers who have confessed their faith in Jesus Christ and understand the meaning of the Lords' supper are invited to participate, though the understanding of the Mennonite Brethren is that baptism should precede participation in the communion service. USMB members reject the swearing of oaths, membership in secret societies, and bearing of arms in warfare. The church allows alternative types of service during times of war.