Why is it important to have your I-20 form while traveling outside of the United States on a STEM OPT extension?
You need this document to ensure smooth re-entry back into the country.
Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Why is it important to have your I-20 form while traveling outside of the United States on a STEM OPT extension?

### Input: Not applicable

### Response:
You need this document to ensure smooth re-entry back into the country.<|im_end|>