The way you word your question makes me assume your husband is in the DEP for the Regular Navy. If that is so, he is not yet absolutely committed to shipping out, as he will be required to take the oath of enlistment again, on his ship date. Should he refuse to do so, the Navy will have no choice but to DEP Discharge him, with no repercussions.
I sincerely hope he does not change his mind, as the Military needs as many intelligent, eager young people as it can find and the job skills and other benefits are much better than he will ever find on the outside.
Just take a look at the want ads in your local newspaper, you will find all kinds of ads stating: "Help wanted, must have experience". The US Military says: "Help wanted, WILL TRAIN". You decide which is a better deal.