Hi Wife,
It is wonderful that you want to help your husband, he is lucky to have you. Be patient and kind, listen when he talks, don't think of him as lazy, think of him as unable to function. Be willing to support him if he does decide to go to counseling, but do not push him or make his appointments for him. You may want to go yourself to get help with dealing and you can invite him to go if he wants. "You can lead a horse to water but you can't make him drink" - I know you want him to go to counseling but it will do him no good if he doesn't want to be there. It also does not mean that he'll suddenly get over it.
I guess what I most want to tell you is that depression takes time to overcome. For some of us it never really does away, it becomes a management issue. It may be that your husband has post traumatic stress syndrome. He's been through alot. Processing that has got to be difficult and it's no wonder he has stopped functioning. Consider that he spent the time he was away being "on" all the time. His life was a crisis and now that he does not have to be in that mode he has "shut down".
I know that this does not help that much, but hopefully it gives you a perspective and helps you to understand that he doesn't really want to be like this either. Give him some space to work through what he needs to, keep him mindful of how it affects you and the children, this way he can process those things also. Try to be loving and kind when you tell him, remember that he is really not trying to hurt you with his depression. (I wish my husband could understand that)
I hope that he is able to begin to see what he needs to do to move on with his life soon. Perhaps suggest that he can speak with clergy, his primary doctor or a respected friend. Maybe he should see this site and maybe it would give him an outlet for what is bothering him. These are all suggestions you can make, it will be up to him to accept them.
Hang in there Wife, your love and support are what he really needs even if it doesn't seem like he knows it right now