Well usapa believes that "cactus" is unsafe, I am sure you will see some more usa today ad's on the matter.

From the PHL usapa reps:
"On another note, Captain Ed “Mr Integrity” Bular, announced that the Company has decided to go ahead with a common call sign for East and West. Even though the BPR had previously indicated that, in the interest of safety, FAA guidance on this subject should direct the Company to adopt a call sign having some sort of association with either the name of the company or its aircraft paint scheme, the decision was made to use “Cactus.” It is becoming more apparent every day that decisions emanating from “Team Tempe” are not based on safety, but on some incomprehensible thought process. Stay tuned for more on this subject."