I look like somebody

I think I must look like somebody else that lives on this base. Today I was walking out of the post office and this guy in uniform was walking in. He looked up at me and said "Heyyy, how's everything going?" He said it like he knew me, but I thought maybe he was just being friendly, so I said I was good. Then he continued on and asked "Are they keeping you busy up there?" I said "yep, always busy, have a good day" as I kept walking out the door. I wasn't rude, but I kept walking, because Colleen was already out the door in front of me and I had to keep up with her. I wonder who he thought I was? I wonder if he figured out I didn't know who the heck he was. I have heard people say that everybody has a twin somewhere. But I already have a twin, could there be another person that looks like the Good twins? hmmmm