WHY WAS IT UNUSUAL FOR ENDER TO TRANSFERRED AT WHAT ARMY? ALSO ENDER DOESN;T DOESNT WANT IT ACCEPT THE PROMOTION. WHY???

At dinner, Alai and Ender discuss Ender's ability to manipulate the desks' security system. Ender agrees to help Alai with his desk, but when they return to the barracks, Ender finds that he has been transferred to Salamander Army. He is upset to be promoted, now that he has a true friend. He hugs Alai "almost as if he were Valentine," and Alai whispers "Salaam" and kisses him on the cheek. Ender appreciates the tenderness and senses that the kiss and word are somehow sacred to his friend.