Many times loved ones who have passed away stay around you. It is easier in the beginning for them to make themselves known through your dreams because you may not be able to perceive them him other way. You didn't say if he loved you too.It seems he did and doesn't want to leave.
If you love him..meditate and tell him it is OK to cross over. He may perceive that you still love him deep inside and this could be holding him here. You can meditate and see him as though he is there with you, make him life like.
Tell him you are so sorry he died. Tell him anything you wish then release him.
I would suspect that it's your lack of closure over the issue. You never had a chance to say good-bye and you lost him while you were still in love with him; so, you are left with only good memories of him. Counselling would be a good option because your husband is doing the impossible - he is fighting a ghost.
You need to deal with your memories of your deceased boyfriend. Both you and your husband deserve it.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.