Multiple years of wood knocking and primate-like behavior described by a soldier hunting near Manistee witnessed in Mason County, Michigan

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I had reported earlier (Michigan Report #808) about sightings I had when I was in high school. In October of 2003, I as home on leave from Korea (I'm an officer in the Army, currently a Lieutenant Colonel, but at the time of this report I am submitting, a Captain). My dad and I were planning on doing a lot of bow hunting while I was home and got two areas set up - a bow stand for me and my dad sat in the ground blind he used for rifle season. The location is near Manistee, Michigan, East of North Custer Rd and North of East Custer Rd. Over the course of four mornings, we entered the woods approximately one hour before daylight to set in and let things calm down. The first morning, 11 October 2003, we moved in and split up to our positions. I was on my stand, settled in, and immediately heard three distinct knocks, from the North of where we were. Farther North, I heard an answer. There is a cabin to the West, and I figured it was those guys, as they are usually up on weekends for hunti...