Amish

In Eastern Christianity, beards are often worn by members of the priesthood and by monastics, and at times have been recommended for all believers. Amish and Hutterite men shave until they are married, then grow a beard and are never thereafter without one, although it is a particular form of a full beard - without moustache. 

 Amish and Mennonites are committed to a lifestyle of peace and non- violence. A long beard is the mark of an adult Amishman. Mustaches, on the other hand, have a long history of being associated with the military, and therefore are forbidden among the Amish people.