Christmas is probably the largest Holiday celebration for AMS, and new Officers, Planes, Robots, and Appearances are rolled out every year.
The Christmas 2020 Events were rolled out on 2020-11-30, and the details of the activities are listed here: 2020 Christmas Activity Announcement
- New Officers:
- New Plane: Arctic Sleigh
- New Plane Gears: Devil's Descent and Sled Companion gear sets
- New Robot: Christmas Devil
- New Appearances:
- Cake Castle
- Gingerbread House
- New Troops:
- Snowman Soldier - T12 level Commandos
- Armored Sleigh - T12 level Vehicles
- Christmas Airship - T12 level Copters
- Christmas Cannon - T12 level Artillery
2020 Christmas Activities and Events:
- Christmas Sticker: A sticker event with a twist: instead of trading stickers for gold, Smiley Seals are the currency (likely to prevent people from transferring gold from their farms to their main planers).
- Christmas Rebate: Recharge Purchases meeting the listed requirements result in bonus packs for free.
- Holiday Perks: Activate Holiday Season Perks for daily rewards, including packs of the new 2020 Christmas Troop types.
- Gear Cultivation Swap (12/1-3): For a fee you can swap your existing plane gears for others, including the new Sled Companion set
- Plane Swap (12/4-6): For a fee you can swap your existing planes in the allowable "source" list to a different plane in the allowable "target" list (Conqueror, Ice Dragon, Flame Feather, Spaceship).
- Christmas Recruitment: A special recruit pool using Christmas Recruit Signets (available for purchase at about $5 each) that allows you to recruit either fragments or full officers (see the Announcement for details on which officers can be recruited on what date).
- Battlefield Pass: A Gent Code-like event, with Pass Points as the currency. You can purchase an Elite Pass for $10 that unlocks additional rewards, including 100 fragments of Shield Maiden.
- Unit Modification Order (12/2-3): Full-Firepower-like event allowing you to get Smiley Seals.
- Enhance Order (12/4-6): Full-Firepower-like event allowing you to get Smiley Seals.
- Various Battlefield Buffs, including a very rare VIP +50% efficiency buff (on 12/1 only).
It looks like the initial event announcement only has activities from 12/1 through 12/8, so I expect weekly announcements with new activities up until 12/31.