My speculation would be along the lines of Excuse_me's post in 295 concerning unsatisfactory performance, but I dont know if it would entail taking away personal awards and the like.
Let me refine my question. Are sections 1162 and 63 routinely invoked to give honorable separations?
For enlisted men the concept is fairly simple. You do your six years and you're out, obligation is finished. For officers it is more complex. Is it typical for reserve officers to remain under obligation beyond their six years?