Normally the flag is displayed or worn such that the star field is at the upper left corner (as viewed)
The exception is when the flag is worn as a patch on the RIGHT shoulder. A flag patch worn on the right shoulder should have the star field at the upper right.
Why? Because Americans are not supposed to retreat in battle, only advance. When a flag was carried on a guidon, the star field was nearest the pole and thus lead the way forward. This tradition has been modernized to call for the reversed patches on soldiers' right shoulders so the star field is always leading the way forward.