Aside from prayer at all functions, there are prayer breakfasts and various social events surrounding Christian holidays, not including Christmas and Easter. For example, there are the formal dinings-in for St. Barbara (patron saint of artillery -- better be there if you're an artillery officer) and events planned for the Passion. There were a few more surrounding some other Catholic traditions, but I can't remember specifics. I just know they happened often because I was the one who arranged them.
The Infantry has St. Maurice. Same story - you'd better be there if you're an infantry officer.