SR-71: There are none left - the trainer was cut up also - tools long gone. Last one flew in 96-98 - there was talk of reactivating the 3 remaining after 911, but was too expensive for the AF brass, so off to the museums.
SR-71: was. Like many things gone which were conceived in the 60s that have no equal currently.
My dad was a member of that project team @ the skunk works.
There was one at Wright Patterson AFB museum some years ago.