20th - 22nd of December - 50% discount for US, Soviet and Japanese vehicles.
22nd - 24th of December - 50% discount for German and British vehicles.
24th - 26th of December - 50% discount for Chinese, French and Italian vehicles.

https://warthunder.com/en/news/6536-new-year-in-war-thunder-en

はて？
車両半額セールって10月のアニバーサリーだけだと思ってたんだけど
年末もやってたっけ(´ω｀)？