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I tried to get Duplima for Avan because i want to change his class to scout elite. I did the august mission Killer Assault a couple times and i got diploma for other characters but not for Avan. Even if i used only Avan he just get Attk credits its annoying.
Just bad luck man - it's somewhat random. If you get the DLC missions, there is one that is a guaranteed of Diploma or Certificate (or, more often, a mix of both). That's the only possible credit rewards from it, so it's the cure to all the annoyance of trying to get them that you normally suffer through :-)
The DLC is pretty amazing - just telling you. It's extremely cheap - 10$ - maybe less ? I forget - but it's less than the cost of a small pizza, or about the price of a Big Mac Value Meal from McD's ! :-)
You get something like 15 missions - a lot of them pretty challenging and fun, and access to some ridiculously good special weapons.
That aside, it's just random - one trick you can do is have only 3 or so guys running the mission, and "eventually" one of those 3 that you actually wanted to, will get the Diploma :-)