Hello, seeking a film's name:
plot is a soldier decides to leave a war; seeing the "craziness" of it all.
He gets together with some people in an insane asylum.

They somehow become free of the authority of the asylum, and become self-sufficient.
They are free to act their "unique" selves.
They each spend much time preparing to put on public performance.

Sometime near the end, soldiers show up, and an army tank is also involved (and maybe a huge clock on top of a building.

can anybody remember this one?

roger