When the US entered World War I in 1917, military chaplains catered to majority white and Christian soldiers. Today the armed forces recognize over 200 denominations and religious groups.
The traditional role of chaplains is changing. They are increasingly present in social movements such as Occupy, Standing Rock and Black Lives Matter.
The National Council of Churches, which represents 38 Christian denominations, has long been the voice of progressive religion. But over the years, its influence has waned.