There was a mid-air collision of two Hueys on 28 MAY 67 at Ft. Knox while demonstrating for West Point cadets that killed 9 and injured 10. Go to www.armyaircrews.com/huey.html and scroll down to that date.
If you want a news article, let me know and I'll see what I can find.
One of the pilots was a childhood/high school friend. His tragic death shook our little town. Everyone was upset. His wife was a very close friend as well. It was a horrible time. I visit his grave often and leave a flag for him. His parents are now deceased. No family resides in our small town at this time.
I was in the stands as a child. I remember the day well. It was a glorious day and we went out there to watch the demonstration. My father was an E-7 (Sgt. Edward F. Bashaw) in the Armor School and he was really excited to take us out there to see the vehicles in action. I remember the tanks coming over the berm and the copters flying towards the crowd and splitting off. I was mesmerized by the helicopters, never having seen them so close up before (they were always away on the flightline at Godman AAF). I saw the rotors hit and everything seemed to stop in that instant and they just seemed to hang there before the fireball and the sound swept towards us. I saw them hit the ground and the fire get more intense. The announcer shouted "Oh, my God" and then stammering for what to say. I was only 7 but I knew I had just seen people die. We were rushed out of the stands and the rest of the day my mother just sat pale in the living room of our quarters.
If the date provided in this string (May 28, 1967) is correct, I was 8 1/2 years old. (I thought I was a couple of years older, because I still have a vivid memory.)
Civilian visitors where allowed, and we sat in bleachers out in a field (I believe it was a training ground) away from Ft. Know housing and other buildings.
The show included tanks and troops that were paraded by the bleachers.
I believe as the show was concluding, 3 helicopters came toward the crowd, in a formation of a small helicopter (sorry, I do not know what is the proper name) with the 2 Hueys trailing it and laterally spaced from each other.
The small helicopter flew over the crowd, and the 2 Huey turned away from each other to go around the crowd. When they turned, I believe the tail rotors clipped, so that the tail of each pointed down toward the ground. When it happened, I did not know that the rotors had clipped. I simply thought that they were maneuvering. Then one hit the ground and burst into flames. Shortly afterwards the second Huey hit the ground. The crowd was quickly ushered from the bleachers to buses, which took us back to our cars.
For many years, I had a newspaper clipping. I believe it was from the Radcliff Sentinel. Radcliff is the civilian town adjacent to Fort Knox, and the Sentinel was a local (I believe weekly) newspaper.