Battle of Topolobampo Action of 9 April 1914 Fourth Battle of Topolobampo Second invasion by the United States (April 9, 1914 – November 23, 1914) United States occupation of Veracruz Historical ships Schooner Anáhuac Schooner Iguala Cutter Campechana Cutter Chalco Cutter Chapala Cutter Orizaba Cutter Texcoco Cutter Zumpango Cutter Papaloapan Cutter Tampico Cutter Tlaxcalteca Cutter Tuxpan Ship Congreso Mexicano (previously called Asia and San Jerónimo) Brigantine Constante Brigantine Vicente Guerrero Steamer paddle frigate Guadalupe Steamer paddle frigate Montezuma Steamer gunboat Libertad Steamer gunboat Independencia Steamer Guerra Demócrata Steam yacht Orizaba Gunboat Democráta Gunboat México Corvette School ship Yucatán Pontoon Chetumal Gunboat Tampico Gunboat Veracruz Gunboat Nicolás Bravo Transport vessel Progreso Transport Vicente Guerrero Gunboat Agua Prieta Coastal defence Battleship Anáhuac Auxiliary ship Zaragoza II School ship Velero Cuauhtémoc Organization The President of Mexico is commander in chief of all military forces. Day-to-day control of the Navy lies with the Navy Secretary, José Rafael Ojeda Durán. In Mexico there is no joint force command structure with the army, so the Secretary reports directly to the President. The Navy has a General Headquarters and three naval forces. There are furthermore eight regions (four on the Pacific coast, three on the Mexican Gulf coast and the Región Naval Central, grouping the naval forces, based in and around the capital Mexico City, such as the 7th Naval Infantry Brigade, the Central Special Operations Group and the Air Transport Squadron), thirteen zones, and fourteen naval sectors. The Navy is divided into three main services designated as "forces": Gulf and Caribbean Sea Naval Force Pacific Naval Force Naval Infantry Force Other notable services include: Naval Aviation Search and Rescue Officers are trained at the Mexican Naval Academy, called the "Heroica Escuela Naval Militar" ("Heroic Military Naval School"), located in Antón Lizardo, Veracruz. Naval Infantry The Mexican Naval Infantry Corps was reorganized in 2007–2009 into 30 Naval Infantry Battalions (Batallones de Infantería de Marina – BIM), a paratroop battalion, a battalion attached to the Presidential Guard Brigade, two Fast Reaction Forces with six battalions each, and three Special Forces groups. The Naval Infantry are responsible for port security, protection of the ten-kilometer coastal fringe, and patrolling major waterways. The Naval Infantry also is responsible for 23 National Service Training Units under the responsibility of the Navy Secretary, enforcing the National Service obligation for Mexicans of teenage and young adult age. Naval Aviation Search and rescue units In