'Personal medallions' of the captain
Here's something I didn't understand:
A fireman gives the captain the files on the family the police arrested the day before. The captain tells him to remind him to give him one of his personal medallions. I already have one sir, he tells the captain.
The captain reacts surprised. I don’t know what to make of this dialogue. What are those ‘personal medallions’ what are their importance to the movie and why does he want to give one to the fireman? Also, how did the fireman already obtain one of them?