Why Thor's Hammer is on military headstones

John Brownlee on how the U.S. military's epic journey into religious tolerance reached Odinism.
Mjölnir is a weapon of honor and virtue, and a fitting symbol for any noble warrior. So it’s appropriate that American soldiers can now request the symbol for Thor’s Hammer be placed on their headstone if they die in the line of duty. But Mjölnir’s path toward becoming an acceptable headstone option wasn’t easy. It practically took the power of Thor to get it there.