I might just leave it alone for a little while. Maybe check back with the commander in a couple of weeks. Make it clear to him that you are worried about H but you think it would only hurt things if he knew it was you that brought it up. They will respect your wishes on that. Make sure the new commander knows how he has changed. Make sure he knows you don't think he is stable.
Is there any chance of him getting deployed again? Did you say he is in the reserves? What branch? Has there been any contact with H? I know you said he gave you his new cell number.
