All that is true, but no one testified he was standing while in Dealey Plaza, and the photo is outside Dealey Plaza, as listed in the 6th Floor Museum.
You stated ... “[B]ut no one testified he was standing while in Dealey Plaza, and the photo is outside Dealey Plaza, as listed in the 6th Floor Museum.”
Here is what Menninger wrote about that .....
“In its narrative of the assassination,the Warren Commission did mention in passing that ‘Special Agent George W. Hickey Jr, in the rear seat of the Presidential follow-up car, picked up and cocked an automatic rifle as he heard the last shot... At this point the cars were speeding through the underpass and had left the scene of the shooting but Hickey kept the automatic weapon ready as the car raced to the hospital.’ “
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“Donahue spotted several inaccuracies and omissions in this [Commission’s]statement.
First, Hickey had picked up the gun before - not after - the last shot, according to both Glen Bennett, the agent who sat beside him, and S.M. Holland, the railroader who had watched the motorcade from atop the triple overpass.
“Similarly, the Warren Commission’s statement that Hickey did not pick up the gun until the motorcade was speeding through the underpass was contradicted by no fewer than eight eyewitnesses... plus [5 named] agents had all reported Hickey had the gun in hand at or just after the time of the shots, well before the cars disappeared into the underpass.
“Similarly the Warren report further asserted that Hickey had cocked the gun after he had picked it up. But [Secret Service Agent] Roy Kellerman had testified that the AR-15 was on the floor of the car and “ready to go”, i.e. loaded and cocked.”
See Menninger book, Copyright 1992, p220