Hmmm, i am an ex serviceman and have worked with and employed a load of ex service personnel myself. I have seen this before. In general i think it kinda works like this.
Half the people who are ex services are really self disciplined and very hard workers. They got on well in the services as it was a very controlled environment. They also thrive after the service.
The other half took the attitude that they would do as little as possible without being pretty much forced to. Thats ok because the services were more than happy to force em to work hard. Went out on the piss till 4 am with your mates? tough shit, crack on.
The second group find adjusting to work after the service somewhat difficult, as in most firms people are too busy or just not inclined to force people to do things, they tend to just sack them. It takes a while for this type to cotton on, but most of them get there in the end, they are generally hard workers they just have to get used to the fact that they need to be self motivated.
Whatever the rights and wrongs of how you found out, id definitely have a word, gently, and just try to explain how things are different, and how hard it can be to find jobs at the mo etc. Its your daughter you are well within your rights to look after her interests. Most service people appreciate plain speaking IME, if he's offended hell let you know.
good luck