This name tag was a spare of the type worn on an astronaut's flight suits and flight jackets. Kathryn (Kathy) Thornton flew on the Space Shuttle as a mission specialist in 1989 (STS-33), 1992 (STS-49), 1993 (STS-63), and 1995 (STS-73). She performed spacewalks on two missions, including the STS-63 servicing mission to the Hubble Space Telescope.
NASA transferred a number of spare astronaut name tags to the Museum over the years, this one coming in 1996.
This object is not on display at the National Air and Space Museum. It is either on loan or in storage.