S.A.
Many have an adjust period to go through after deployments - especially long ones like this. So, you are not alone and most likely he is worried about it as well.
Don't try to push of force things. We don't live in a "Norman Rockwell" world and so things won't be perfect. Take things slow. If he seems to be hanging back and not taking the lead he may be trying to figure out what the lay of the land is now at home. If he tries to take the lead on everything try to speak with him about it in a calm manner and possibly with some humor.
You may want to speak with your husband privately and "update" him on what you do and do not allow your son to do now. I'm sure rules have changed a bit for him and it is best to keep things equal between both of you on that. It is best that your son does not see mom and dad argue about discipline and such - that needs to be behind the scenes so he doesn't know about it. Parents always need to present a "united front" to kids.
If he is Guard or a Reservist he will have a lot to adjust to going back to civilian life after the regimented military life during deployment. Watch for signs of PTSD and seek help if needed.
I've been a military spouse for over 24 years, last deployment was to Iraq, so I've kind of "been there, done that, got way too many t-shirts"! LOL Feel free to email me directly if you wish - ____@____.com