WWI Army service silver ID card "Presented by the County of Jackson Michigan"

Description

WHAT:
Rare silver plated card issued to a soldier named Leo H. Reardan for his service in World War I. I wonder if this served as his military ID or entrance to a VFW.
LOCATION:
Jackson, Michigan
SIZE:
2 by 3.25 inches.
CONDITION:
The edges have wear from being in his wallet.