For reference; your in-game active mission reminder- "TAB"

husband, on Jan 15 2015 - 11:20, said: A heads up *if you didn't already know* - if you press tab in battle; the Order of Battle page also gives you the current mission you have activated that applies for this vehicle class. If it is blank then you forgot to activate the next available one in your campaign. You can have a mission activated for each of the 5 vehicle classes concurrently through your Mission's Campaign tab.