Elite Commendation

Elite Commendations are an elder game commendation that can be earned from flashpoint and operation bosses and by completing level 55 weekly missions. They can be used to purchase specialty items from Elite commendation vendors. Elite Commendations have a max limit of 400 and a weekly earning limit of 200.

Source
Elite Commendations are mission rewards that can be obtained from story mode operation bosses in Scum and Villainy and Terror from Beyond. They can also be obtained from weekly missions.
 * Mission reward