George,
From what I have learned Ruthless Riders was the squadron name for the entire 7/17th. Each Troop had its own call sign. Troop A was the Tornadoes. Red were scouts, White were guns. Troop B was the Scalphunters and Undertakers. Troop C was Blue Ghost. I am waiting to hear from a couple more sources before saying for sure. Bob Kilpatrick got me pointed in the right direction with the info he sent to me.