I think the body cam footage is from a local swat officer. I saw the edge of his shirt sleeve at the 1:04 mark (black short sleeve shirt) At the 2:14 mark you see another officer wearing black short sleeve shirt and it says SWAT on his back. Everyone else is wearing camouflage and is says police on their back.

He is initially taking cover standing behind a township police vehicle. He then talks to fellow officers in the area calling them out by first and last name. I doubt a secret service agent would know these officers by first name.

At the 2:46 mark you here an officer on the radio stating they need an ambulance for someone injured in the stands near the yellow crane.

You then hear sirens from the ambulances in the background.

At the 3:25 mark you hear a second officer stating they need an ambulance at the VIP tent.

At this point it seems they are all on the same radio frequency. This is where it gets interesting.

At the 8:55 mark the swat officer says, "I saw him on the roof, I dropped down and was calling out. Are we not on the same frequency?"

I wonder if someone had a radio jammer blocking radio transmissions in the area for a short time. Is this why Cheeto said they didn't have any radio communications?

If there were officers on the perimeter who were engaging the shooter (calling out on their radios) and officers at the rally who were all on the same frequency, they should have removed Trump from the stage.

https://www.youtube.com/watch?v=jSFoHk_LLDo