Plane collides with Blackhawk helicopter Washington DC

[quintessentone]

So the NTSB investigators seem to be on the track of human error in the form of fatigue, which could be the control tower and/or pilot(s) but I wonder about the confusion created by the military and control tower/passenger planes being on different communication frequencies. It seems that they are looking for human error, but I am just speculating.

BTW, tblog I follow is by a pilot with 20,000 hours in the air and he said in a previous video about some other incident, that 1,000 flight hours is extremely low in the sense of experiencing any and all events that makes an experienced pilot.