What is this thing hanging of this cars mirror?

Dec 2013 ⋅ ⋅

My father has this PIN. He doesn't remember what its for. He was in the Army for 24 years and served in Vietnam.

Mar 2014 ⋅

⋅ ⋅ #24

Found this in my rental house [MA]

Jun 2013 ⋅

⋅ ⋅ #MA