Huge black triangular shaped object, makes itself invisable.

This happened in 1986 at 12:00 p.m lunch time. Don't know what month or date it was. It was my junior year in Hollywood High School. I was walking towards the cafeteria/auditorium suddenly I stopped as if someone told me to stop don't move or else, so I stopped, looked up at the Hollywood High School cafeteria/auditorium this huge black triangular shaped object just appeared hovering on top of the cafeteria/auditorium. It looked like the mothership itself, it made a buzzing sound. As if time stopped in seconds when I looked up. It made itself invisable when it moved away it disappeared. After seeing the huge black triangular shaped object move away slowly there were five helicopters behind it. They were not chasing it just following it slowly. Than in minutes they were gone. Then this part is going to sound crazy and strange after seeing all this happen there were two men in black coming towards me. I got scared and said who are you, what are you doing, where are you taking me, he didn't answer, took me to the side of the P.E area we were walking and walking then I went blank I didn't know what happened from there. After two days passed one of my classmates said what happened to you, you were gone for two days. I was confused to what happened to me. The strange thing is that the army or some soldiers were making the students take some kind of test that day in the library when alot of students saw this black huge triangular shaped object. I didn't report it sooner, because I was scared of this thing, the others students also. This is a true story.
Witness elects to remain totally anonymous;  provides no contact information.  PD