On May 3rd, 1947, the Constitution of Japan entered into force to declare the state’s status as democratic and pacifist. Lawmakers did their job brilliantly - there were no amendments to the Constitution for the whole 75 years of its existence!
“Sakura blossom” decal
From 3rd May (12:00 GMT) until 5th May (07:00 GMT) play 3 battles in Japanese vehicles (rank III or higher, with an activity of not less than 70%) to achieve the special decal “Sakura blossom”.
Complete the task in random battles, except for Enduring Confrontation missions and [Assault] mode. Track your progress in the hangar by clicking Nickname → Achievements → Japan’s Day.
You may find the decal in the “Other” tab in the Customisation menu.