Commander Air Group
The most senior pilot aboard a Battlestar, responsible for all "air" operations.
The Battlestar Galactica's last CAG Captain Jackson "Ripper" Spancer was killed in the opening minutes of the Cylon Attack on the 12 colonies. He was replaced by Captain Lee "Apollo" Adama, eldest son of the Galactica's commanding officer William Adama.
"CAG" is a US Navy term that has gained widespread recognition through films such as Top Gun and television series such as JAG.