Nobody invaded Alaska on my watch. 
I was a Weapons Controller in Alaska in 1975. Russians would come across the border 5 miles and then turn and fly inside our border untill I scrambled F4's. Then the would fly along the border on their side for a bit and RTB.
It never got old, we never got complacent or lazy. Those were high stress times then and it was very possible that the next inbound hostile sortie could be the real one.