https://en.wikipedia.org/wiki/Attempted_assassination_of_Ronald_Reagan
https://en.wikipedia.org/wiki/Secret_Service_code_name
George Washington University Hospital
Attempted assassination of Ronald Reagan
30 March 1981, United States President Ronald Reagan was shot and wounded…
After the Secret Service first announced "shots fired" over its radio network at 2:27 p.m. Reagan—codename "Rawhide" —was taken away by the agents in the limousine ("Stagecoach").[44][16]:66
No one knew that he had been shot. After Parr searched Reagan's body and found no blood, he stated that "Rawhide is OK…we're going to Crown" (the White House), as he preferred its medical facilities to an unsecured hospital.[26][45][44]
Reagan was in great pain from the bullet that struck his rib, and believed that the rib had cracked when Parr pushed him into the limousine. When the agent checked him for gunshot wounds, however, Reagan coughed up bright, frothy blood.[40][26] Although the president believed that he had cut his lip,[45] Parr believed that the cracked rib had punctured Reagan's lung and ordered the motorcade to divert to nearby George Washington University Hospital, which the Secret Service periodically inspected for use.[27] The limousine arrived there less than four minutes after leaving the hotel, while other agents took Hinckley to a DC jail, and Nancy Reagan ("Rainbow") left the White House for the hospital.[46][45][44]