Alright as announced here are the RvS Coop rules for season XII.

RvS Coop Ladder Rules:

Team size: 4 players(AI backup allowed; at least 2 human players)
Missions: 4
Time: 60minutes(will also be taken as default value if you don't accomplish a mission)
Submitting of each mission: unlimited
After Action Screenschot must be made and stored in native format until the end of the season + 1week(details see below; if you can't provide a screenshot if asked the default time will be taken)
iGuard activated
Camera settings as well as other game settings are equal to the RvS Team ladder


So far the very simple game settings. To win the RvS Coop ladder you have to play all 4 missions and submit your time. The clan with the shortest overall time is the winner of the season. In the case of a tie, the outcome of each single mission will be compared.

The missions you have to complete:

EASY:

Mission 1:
(MP) STREETS
Terrorist Hunt
Elite
30 Tangos

MEDIUM:

Mission 2:
(MP) WAREHOUSE
Terrorist Hunt
Elite
35 Tangos

&

Mission 3:
ISLAND ESTATE 2
Terrorist Hunt
Elite
40 Tangos

DIFFICULT:

Mission 4:
SHIPYARD
Hostage Rescue
Elite
40 Tangos


Submition:

Just post your best times in the according BL Forum thread, together with the Mission name and participated players. The BL admins gonna add the times to the ranking table until I have updated the BL script.

Proof of Success - Mission time:

Here comes the tough and annoying part. Raven Shield doesn't show directly how long you needed to accomplish your mission. The after action screen doesn't show your time. So to get a proof of your time you have to take an ingame screenshot: when the mission success message appears, press the key to show the current mission stats and then make a sreenshot. You can find an example shot here.

Closing words: Teamwork, tactics and skills gonna decide who will win the ladder. Especially the Hostage Rescue missions allows a lot of different ways to accomplish the mission. Watch your six and don't forget the season gonna end already in 2 weeks so good luck everyone!