The first two were set up inside the Secure Perimeter and were on rooftops (I think all were on rooftops)
Beaver county was outside the secure perimeter inside a building looking out over the crowd. This building was adjacent to the AGR building Crooks climbed on to
So them not being on the roof was a mistake. But USSS is responsible for the plan
There was also a request for a police car to be stationed near that building, but supposedly they didn't have the manpower
There were three sets of counter Snipers
USSS
Butler County
Beaver County
The first two were set up inside the Secure Perimeter and were on rooftops (I think all were on rooftops) Beaver county was outside the secure perimeter inside a building looking out over the crowd. This building was adjacent to the AGR building Crooks climbed on to
So them not being on the roof was a mistake. But USSS is responsible for the plan
There was also a request for a police car to be stationed near that building, but supposedly they didn't have the manpower
Details here. Can't copy and paste, but they said a lack of manpower and extremely poor planning out Trump at risk
https://beavercountian.com/content/daily/beaver-county-officer-warned-of-seeing-man-with-rangefinder-before-trump-was-shot