This career change is something that if you have not already talked over with your wife in some detail, you need to do so. The hours, the non traditional days off, the holidays and birthdays missed. If you have kids, the events you won't be at, etc. More importantly, the fact that she needs to be aware the possibility exists that you may be seriously injured or not come home again.
Tho the latter can happen on any job and there are more dangerous jobs (for those of you tempted to post it is not even in the top 10 most dangerous; don't bother in this forum).
If she isn't accepting of this, your marriage will be affected and even if she is, it will still be affected to a degree due to the reasons I listed.
Something to think about.