While I was on the Strip near Vault 21 I saw two patrol bot. One Mk 1 Robot with a police face and another Mk 2 Robot standing directly in front of it. They were not moving. So I decided to take C4 and place it in a circle around them. When it detonated the Mk1 Robot Flew at least 200 ft. in the air ( I know this because it showed me in slow-motion). It was awesome. But are Mk1 robots still supposed to be there?

They are likely left over from the 'naked' dancers in the Ultra-Luxe scripted event. This has happened to me as well.