I am only familiar with the Navy branch of the military and my husband works when they tell him to work, which could be as early as 4am until midnight or just for 2 hours. He has been gone for only a few days up to 8 months on missions and deployments. He is now stationed in DC with NCIS and when he has to he stays in DC for a job until it is done - they put him up in a hotel with the other men on his team.
Also, due to my husband's job, he gets calls at all hours of the day and night. Some of which he has to go in for right away.
Whatever you do, don't make plans ahead of time for your husband unless he has put in for leave time. Even then, it isn't 100% guaranteed that he will get to keep it if something comes up in his unit and they need him at the last minute.
Welcome to the military. :)
at 10:07 AM on Jun. 27, 2009