FEMA Costume

I went to a neighborhood halloween party last night. All of the kids were in costume, but only a few of the adults were, which may have added to my confusion when I noticed a man wearing a polo with FEMA embroidered on it with some sort of seal embroidered also. He wasn't very talkative, so I didn't overhear any discussion of his "costume" decision, so I avoided asking him about it until he was getting ready to leave. He had a small cart filled with chairs and an ice chest, so I made my move:
"Working on your evacuation?"
"Uh, no. I just live on the other side of the lake."

What the hell does that mean? Was he playing the character completely? Was he an actual FEMA employee?