How do you feel about active-duty service members that wear altered patches on there uniforms?

On deployments you may see some uniform variations that would not be seen while stateside. One of them is the wearing of patches. Do you or have you seen this while you were deployed. If you were working with another nation's military would you wear their flag on your uniform as a sign of partnership? Can this get carried away or is it a means to show some motivational patch? Should be strictly adhere to our regulation even while deployed?