So I was downtown on sunday watching the veterans day parade, and there were some retired marines in front of me, WWII types, and some active duty types to my right. They all saluted the Ensign as it passed via colorguard (not individual flags hanging off the back of the float), which I know is appropriate, but then there was some inconsistency with either group saluting O-types on the floats themselves. What's the proper form in this situation?