Insignia of the Supreme Command Flag Mexican presidential ceremonies for naval as described in:
REGULATION honors, flags and lights of the Navy of Mexico. Published in the Official Journal of the Federation on Thursday October 19, 2000, PART ONE. Honors; CHAPTER I. Honors for the Position, Article 20 .- Honors President of the Republic:
II. Flag insignia: the insignia of the Supreme Command flags are rectangular, keeping a ratio between width and length of four to seven. When they are lifted should not be raised any other insignia. In smaller vessels, besides the flagship banner carried a long aft National Flag:
A. Naval Ceremonies: the flag of the Supreme Command insignia will be a national flag has five white stars on the green stripe;
Based on:

http://es.wikipedia.org/wiki/Archivo:Flag_of_Mexico.svg
Own work
Sarumo74