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Why is Charon from Fallout 3 using a Combat Knife?

Charon is a follower... he normally uses his Combat Shotgun and I gave him 3 other weapons to have. But, he wont use ANY of them... he just leaves me every time he sees a threat and ends up getting killed.
Is there ANY way I can stop him from using that knife and/or stop him from wandering off? Btw... I gave him enough ammo for the weapons or have I not given any because the weapons say they are full?!