World UFO Day was yesterday but do you know of Oscoda's UFO history?

The Detroit Free Press ran a story on World UFO Day on the four most famous UFO sightings/cases in Michigan history and wouldn't you know, Oscoda made the list. 

Before you click the link locals, let's have some fun and test your memories. This event took place in:
A) 1975

B) 1967

C) 1981

Of course it took place at Wurtsmith, UFO's love air force bases, everyone knows this. Do click the link and if you have a UFO story to share that's what comments sections are for.