People in marriages often talk about the person they married 'X' number of years ago and 'where they went.' The fact is, people change and that's not what is normally show in the Hollywood love stories that people pay to see. The younger a couple is when they get married, the more drastic those changes tend to be over time.
Just as he's changed over time, you probably have, too. Of course, you don't have the influences that he does due to his job, so your changes are probably to a smaller degree. Marriage is about sharing your life and love with someone. It's not a competition or a battle to keep your partner preserved like they were hermetically sealed on your wedding day. The both of you will have to adapt and change for each other over time. Were you exposed to the daily grind that your husband faces, you would either run away or adapt yourself to do the job, do it safely and get home to your family.
Don't lament the person your husband has become. Embrace it. Work with him, meet him in the middle and stop trying to "win." You never will...
Of every one hundred men, ten should not even be here. Eighty are nothing but targets. Nine are real fighters, and we are lucky to have them, for they make the battle. Ah, but the One... One of them is a Warrior... He will bring the others back.
"Wrong door, buddy!"
Let no man's ghost say my training failed him.