Better call him Jimmy 9 Gs now!!!
Jimmy Garoppolo took flight in a U.S. Air Force Thunderbirds F-16 Fighting Falcon recently to prep for his first season as a Raider ... and his run in the jet was so intense -- he got up to speeds of 1,500 MPH!!
The new Las Vegas quarterback hit up Nellis Air Force Base in Nevada for the jaunt through the skies with the Thunderbirds ... and the ultra-experienced pilots wasted no time making sure he was ready to be put through the ringer.
The 31-year-old signal-caller -- whose grandfather is a Marine Corps veteran -- got prepped on how he should breathe while in the back seat of the cockpit .