No, you have to be on good terms but not overly attached, because that may impair your judgement in life threatening situations, in which you might suddenly save your partner instead for example a family of 5 or in the Special Forces even a group of a hundred or more people. That's the real danger. Of course if you are a very logical thinker and can stay rational even in those situations, go ahead, make out with your partner in secret for all your superiors will care, but it's still risky. There is a reason these rules exist.