Trivial Tuesday

Keeping with the moon landing anniversary theme, this week's question is about Apollo 11.  I hope I made it easy enough to answer, but difficult enough to take a little longer.

Most people know that the lunar module had the call sign Eagle ("The Eagle has landed"), but what was the call sign of the orbiting command module?

There you go, it's difficult, I know, but I'm sure some body would have to know.  Have a good day and enjoy yourself.