I've had over 100k Military commendation experience for a couple days now (105,199 right now to be exact) and am still sitting at Rank 3. I'm unable to replicate the Very Rare Assault Squad Officer that's supposed to be unlocked at Rank 4. I have a screenshot but haven't uploaded it anywhere to provide a link yet. It's a Klingon character in case that helps. I'm thinking it's probably a side effect of the efforts to fix the Doff rarity bug in the latest patch.