UFO IN THE CALIFORNIA DESERT

I WAS A TRUCK DRIVER BACK THEN RUNNING WEST COAST TEAMS; MY PARTNER WAS IN THE BUNK SLEEPING AT THE TIME. IT WAS A VERY HOT DAY IN THE CALIFORNIAN DESERT DOWN ON I-8/WE WERE HEADING FOR OUR LAST PICKUP IN YUMA AZ. AT ABOUT NOON I OBSERVED A LONG BLACK LINE IN SOUTHEASTERN SKY.''I WOULD SAY IT WAS ABOUT 75 MILES AWAY/ [NOTE] YOU  CAN SEE THAT FAR EASILY IN THE DESERT IN S/W CALIFORNIA..THERE WAS ALSO A TINY DOT TO THE REAR LEFT SIDE OF THIS CRAFT..AS IT CAME CLOSER TRAVELING N/W ACROSS THE INTERSTATE I GOT A BETTER VIEW OF THE LARGE CRAFT AND WHAT WAS FOLLOWING IT//THE CRAFT WAS A LARGE DIAMOND SHAPED VEHICAL;I SAW THE SHAPE ONLY WHEN IT BANKED LEFT//THE TINY BLACK DOT FOLLOWING IT WAS RECONIZED AS IT CAME CLOSER AS A US FIGHTER JET JUST FOLLOWING IT CLOSELY//LOKED LIKE AN F-14 OR SOMETHING..THE SIZE OF THIS DIAMOND WAS INCREDIBLE.. EASILY 300FT IN LENGTH AND 300FT WIDE; NO WINDOWS OR PORTS TO BE SEEN/NO CAB IN FRONT/NOTHING SEEN UNDERNEATH//IT LOOKED ABOUT 15 OR 20 FT THICK//IT WAS ONLY ABOUT 200FT UP IN THE AIR AND CONTINUED N/W OR LEFT BANK UNTIL IT WAS OUT OF VIEW//I WAS SURPRIZED SOMETHING THAT LARGE COULD EVEN GET AIRBORNE..AND EVEN MORE SURPRIZED THAT THE FIGHTER DID NOTHING BUT FOLLOW IT..TO MY KNOWLEGE' WE DON'T FLY ANYTHING THAT SIZE ANYWHERE IN THE WORLD.. SO THAT'S IT..WHAT DO YOU THINK IT WAS & WHY WAS A FIGHTER JET JUST FOLLOWING IT''FOR MILES AND MILES//VERY STRANGE...