Married Couples Serving Together?

Along with an increasingly equal role for women in the military comes an increasing share of the risk. The tragic number of deaths in Iraq includes more than a dozen women (though I have to say I think that still sounds pretty low considering how many non-combat soldiers are over their right now). That's the point of this story, but it was something else in the story which stood out to me:

Staff Sgt. Voelz died in the arms of her husband, Max Voelz, also a staff sergeant on the 17-person ordnance disposal team on which Voelz was the lone woman.

Setting aside for a moment the sad and poignant picture painted by this event, I have to confess tremendous surprise at the fact that husband and wife were serving in the same small unit like this. I'd have thought the fears and concerns about unit cohesion, equal treatment of unit members, etc., would have cautioned against allowing married couples to be members of the same small unit. Apparently I was wrong, but I am not entirely sure why.