So you get a 3 day gs on your off days while on reserve... later in the month you had a 4 day reserve strech but now only have one because of PB days. So now, on your last day (only day) of reserve would they call you for a GS that goes starts on the reserve day but that goes into your days off? I guess they could just assing you a trip if you don't have golden days but that's quite unlikely.