How do you save transformers revenge of the fallen game?

I got the Transformer revenge of the fallen for xbox 360. How do I save? I try to quit the campaign and it says the progress will be lost. I am at the shangai section but I don't know if the training is over. Can I save during training?How do you save transformers revenge of the fallen game?The game usually auto saves. Check for indicators periodically on the top left/right of your screen.How do you save transformers revenge of the fallen game?yes