It's important to differ from mexican social service and the requirements fto obtain a titulo in the UAG.

The social service is only required if you have plans to practice in mexico, because you need this year of rural service (if any luck near a mayor city) to obtain your license to practice medicine (called "cedula profesional").

But if your plans are to practice outside of mexico, the only requirement is the intership in order to obtain your medical degree "titulo". Just comunicate this to the UAG and they will give you the titulo if you don't plan to practice in mexico.

Hope to be of an assitance.