The Battle of Yavin. Attack on the Death Star

There were counted 30 ships at the battle of Yavin reported by an imperial officer. When the X-wings reported in when ordered by Red Leader you see some of the X-wing pilots as follows:- Red 10, Biggs Red 3, Wedge Red 2, Porkins Red 6, Luke Red 5. You also hear others report in over the com as follows :- Red 7, Red 9 and Red 11. You do not see or here the Gold Squadron report in.