[2] The second Regiment of Mounted Grenadiers was formed on May 25, 1903, by then President of Argentina Julio Argentino Roca,[2] and serves as the national ceremonial unit.

Traveling to Perú, Ecuador, and Bolivia, the Grenadiers took part in the Battles of Riobamba, Pichincha (1822) and Ayacucho (1824), and in the Cisplatine War.

San Martin set out to form a new cavalry corps that would be patterned after the Swiss Army's Mounted Grenadiers.

His goal was to create a unit made up of native soldiers trained in cavalry tactics and mounted combat skills that could effectively support the Argentine Army.

The San Martin Code of Honor, still used today by the regiment, set out the rules expected to be followed by each member of the Mounted Grenadiers.

The Code incorporated fourteen specific points, which stated that it was unbecoming of an officer in the regiment: Sometime later, San Martín wrote a short poem honoring his Grenadiers:

When the "Mounted Grenadiers Regiment" officially came into existence on December 7, 1812, San Martin was promoted to colonel and the unit relocated to improved quarters and better stables.

The regiment had proceeded to the town of San Lorenzo in Santa Fe on the previous day to stop an advance landing party of 250 Spanish troops from marching on the capital.

[citation needed] On his return, San Martin was congratulated by Eastern Bank independence leader José Gervasio Artigas on his first victory.

The Second Triumvirate promoted San Martin to General and gave him command of the Buenos Aires garrison forces.

The next assignment for the regiment was defense duties in an area that is modern day Montevideo, Uruguay along with supporting the Army of the North.

Assisted by now Lieutenant Colonel Mariano Necochea, the regiment prepared itself for the liberation of Chile from Spanish rule and thus, together with the newly formed mounted rifle squadron with Necochea as its commanding officer, raised with 300 Horse Grenadiers, formed part of the Army of the Andes with San Martin himself as its commanding general.

Three years later, Roca's successor, José Figueroa Alcorta, assigned the Grenadiers the role of "presidential escort, protocol and security".

It is the caretaker of the Casa Rosada, the Argentine Presidential Palace at the eastern end of the famous Plaza de Mayo.

The Regiment also mounts guard at the Buenos Aires Metropolitan Cathedral, where its founder's remains are buried, and at the Palace of the Argentine National Congress.