In a way, it is. The movie incorporates elements of true warfare and tank operations from that era, but it also takes some creative liberties for cinematic purposes.
I'm not entirely sure what you mean by 'If I can't: True Story'. It could be the start of a statement about not being able to do something in the context of a true story. Maybe you could clarify what it is you can't do? For example, if you can't face a fear in a true story, you might need to find the courage within yourself. You could start by small steps and gradually build up your confidence.