Originally Posted by RedShirtWalking
I'm guessing it's from the escape pod he lands in.
I'm also still not convinced it's a D since, when compared to the 0 they look almost the same in that shot.
It must be Kirk's. It must have carried his cold weather gear. The "D" does look similar to an "O", but it IS a "D". The left side corners are squared compared to the "O".