It depends which entry plan you're looking into. For DEO the next projected selection date is 7-Sep, and for ROTP they're ongoing.
Please note that these are the dates that Headquarters will do a selection, it can take up to a few days (if someone is selected) to be given an offer.
There is no identified selection date after 21-Sep-16 at this moment.
That does not mean that there will not be another selection, it just means there is no official schedule date at the moment.
If you are not selected as part of that group I would suggest you touch base again approximately 1-2 weeks after to find out if there will be further selections.
Normally it takes 3-5 days after a selection has occurred for offers to be given; however this is the only timing that you will be given an offer. If there are no selection dates scheduled that means that trade is not being selected. Please note that this does not mean there will be no selections after the 21st, it just means that none are schedule at the moment.
Do you know if the selections for ACSO went ahead as scheduled on Sept 21st? I'm just wondering because in previous threads I read it seems like people got their offers a few days after selection, and since I haven't heard anything and a week has passed if that means I probably haven't been chosen for this selection.