Game of Thrones Sword Guide - One correction: Lord Mormont fashioned Longclaw into a wolf's head before he gave it to Jon. Also, Joffery had three different swords, he should really learn to keep them.
"My lords, when Donal Noye was slain, it was this young man Jon Snow who took the Wall and held it, against all the fury of the north. He has proved himself valiant, loyal, and resourceful. Were it not for him, you would have found Mance Rayder sitting here when you arrived, Lord Slynt... Jon Snow was Lord Mormont’s own steward and squire. He was chosen for that duty because the Lord Commander saw much promise in him. As do I." -Maester Aemon
Jeor Lord Commander Mormont (James Cosmo) Jon lets you know that he is aware of his attempts desertion, saying that if execute all who try to desert, virtually no one would be watching the Wall. Then he ordered Jon to join him on an expedition on the wall, meant to counter the threat of wild and white walkers and first find the missing explorer, Benjen Stark (Joseph Mawle).