In Star Wars: A New Hope, at beginning of the attack on the Death Star, we see the pilots of Red Squadron check in.
Luke reports in as "Red Five", however we also hear Ten, Seven, Three, Six, Nine, Two, and Eleven.
My assumption is that since Luke literally just joined the Rebllion, he would be the newest member of the squad and given the lowest (highest? largest?) number.
Is there any explanation on why Luke is "Red Five"?