Updating as there were many treating vets across the course, though not required by rule book to man each jump. <So this is untrue. There is a ground jury and a few official event vets. These vets are at the vet box. There may be other vets at the venue to help their riders in post care but not manning jumps. >
On course you have your volunteer jump judges and the cameras. Back at vet box there is a tent (for this event, not lower FEI levels) with several tvs and multiple course view points mostly with riders in front row. My understanding is that the entire ground jury stays at start/finish , they’re not even riding around to see certain combinations .
Now if there were a fall and/or call to come there’s vehicles to take the appropriate person to meet a fallen rider ASAP , but this is why even if you are eliminated on course you must take your horse to vet box to be evaluated.
I do lean on side our officials are doing their very best to keep a safe horse and rider . But no there are not vets at jumps.