The current law of national symbols, Law on the National Arms, Flag, and Anthem, that governs the use of the national flag has been in place since 1984. Red, white, and green are the colors of the national liberation army in Mexico.The central emblem is the Mexican coat of arms, based on the Aztec symbol for Tenochtitlan (now Mexico City), the center of the Aztec empire. It recalls the legend that inspired the Aztecs to settle on what was originally a lake-island.exico's first largest monumental flag was the one located at the Mirador del Obispado in Monterrey (northeast) with a pole of 120 tons and 100.6 meters in height. The flag measures 50 by 28.6 meters and weighs 230 kilograms, four times the size of most other monumental flags at the time.