Because they're wearing the insignia from our squadron.
5 seconds sound clip from the Battlestar Galactica (1978) movie soundboard.
You can hear this line at 01:41:51 in the Blu-ray version of the movie.
Quote context
[...]
- Well, when you come down, tell me who that is.
- Those three guys right behind the dancer.
- Darned if I know. They sure have lousy tailors.
- Starbuck, you should know them.
- Yeah? Why should I know them?
- Because they're wearing the insignia from our squadron.
- Where is the lieutenant going?
- Um, to find the captain, sir.
[...]