Medals, medals, medals (Metal Gear Solid 5: The Phantom Pain)

That medal employees can receive for performing external tasks we all know. And now here I suddenly itch to play officer of the military detachment longer. Performed several times a number of side missions and repeating a few basic, and then at the end of the next job in the list slipped just steal see the phrase the medal for excellent service. Look at iDroid, find the character that you play, and really the girl received a medal. On missions I didn't send before. And now I have a question. Whether playing a character of the squad, to cross of merit? If you can, what you need to do, what are the conditions to fulfill?
And how many medals you can get by playing the character of the squad?

If this question has already been asked and the answer is, throw please a reference.