Cactus is America West
We have 3 747's at Offutt AFB here in Omaha and they usually have pretty cool call signs but...I was in Lincoln doing a night flight with a student in a C150 and there was an E4 down there doing a checkride.
There call sign was Elma...I gave them a hard time about it and they said it was tactical deception, so I said if they were Elma we were gonna be Sabertooth 150. Tower and approach called us that the rest of the night.

On another x-country fight we heard 3 military birds ...Crusty 11, Crusty 12, and Crusty 13....so I proceeded to do Krusty the clown for the next 3 hours