You mean Bálint Day?

It's Bismarck launch day.

It's actually the Bday of Hungarian assburger Esperantist and world traveler who spoke 22 languages (8 on conversational level).

It's not any of those days at all! Stop trying to steal Valentines day from the Valentine.

The valentine does not get anywhere near enough attention I think, everybody forgets it existed even though they made 8,200 of them. That's only 300 less than the number of Panzer IVs that were made. It's such an important tank yet nobody ever mentions it.