忘れないために置いてある?

There is a tank III in the yard.
Erica seems to be wondering why it is in the yard.
*It is difficult to explain because it contains Japanese gags. Sorry.

Did they put it there so they won't forget?

English:

There is a tank III in the yard.
Erica seems to be wondering why it is in the yard.
*It is difficult to explain because it contains Japanese gags. Sorry.