The "T' has posts into the body but the others are just stuck on and aren't too hard to remove.
I've taken all my rear emblems off with the exception of the Toyota emblem. It has holes in the body so I just left that one. If I remember correctly, I used a hair dryer to heat the glue up, then took some floss and kind of sawed the glue material off. Then used goo gone on the remaining glue. I'll see if I can find a pic.
Edit: Here's a pic
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