The following image shows the Boeing X-37 Orbital Test Vehicle (OTV) - 4, after landing at the Shuttle Landing Facility, Kennedy Space Center:
Why are these people wearing a white coloured suit (which looks like a radiation protection suit used in nuclear power plants) near the X37-B? After a quick search, I came to know these are SCAPE (Self Contained Atmospheric Protective Ensemble) suits, a type of Hazmat Suit, but in a totally different context (In that Wikipedia webpage, NASA technicians were wearing these to fuel a spacecraft). I didn't actually see rescue crew wearing these suits for Soyuz, Crew-Dragon (DM-1) landings (Sorry, I didn't notice this in Shuttle Landings). So what is the reason for this and why don't we see the crew wearing these kinds of suits during other landings?