The following people signed the photo:
Hill Clinton J.
Ex Secret Service Agent in President Kennedy's motorcade during the assassination. Hill is the last surviving passenger of the presidential limousine which arrived at Parkland Hospital on November 22, 1963
Landis Paul E.
JFK Secret Service
Frazier Buell Wesley
The man who drove Lee Harvey Oswald to work on Nov. 22, 1963, when Oswald took that package with him in Frazier's car that is assumed to have been the rifle that killed Kennedy; he was a co-worker of Oswald at the TSBD
Radio newsman, covered JFK White House. Riding in the Dallas motorcade when Kennedy shot, covered the press conference at Parkland Hospital, and picked as one of the few reporters to cover the LBJ oath on Air Force One. He is seen, head down, in the iconi
Hyde Paine Ruth
Friend of Marina Oswald, who was living with her at the time of JFK assassination. According to 4 government investigations, Oswald stored the 6.5 mm caliber Carcano rifle he used to assassinate John F. Kennedy in Paine's garage.
Witness to JFK Assassination and Oswald's Assassination - Was also in Texas Theatre when Oswald was captured - Newsweek Reporter