decontamination training

When I was at Okinawa i trained for a decontamination team in 82,do you get
certificate for that or is there a patch or something.

No, unless it was something locally made or produced that would be used on a float jacket or something. Likely there is no certificate (again, unless locally made and issued) that was done, either.

confirm no on that one.

it's considered annual training and is put in your SRB and unit training jacket