It was the American Red Cross, who are concerned about a significant shortage in the local blood supply, and they were calling to book specific personal appointments for donations.
I explained politely to the nice woman that regrettably, they wouldn't accept my blood because I was a sexually active gay man, and until they changed their rules I would not be allowed to donate blood even though willing.
She said she would make a note of that for future campaigns.
Maybe one of thesed days they'll get around to updating their blood donation protocols.