The Spanish Naval Infantry () is the naval infantry unit of the Spanish Navy () responsible for conducting amphibious warfare by utilizing naval platforms and resources. The Marine Corps is fully integrated into the Armada's structure. The Corps was formed in 1537 by Charles I of Spain (also known as Charles V, Holy Roman Emperor), making it the oldest marine corps in existence in the world, drawing from the . Mission The Spanish Marine Infantry is an elite corps, highly specialised in amphibious warfare, that is, to project an amphibious force onto a hostile, or potentially hostile, coast. Its ability to embark on a short term notice with (land, air and naval) Navy assets, makes it a unit with a high strategic value. Adding to this a high degree of training, and the capability to deploy swiftly in international waters, results in a potent dissuasive force available at a short notice in distant regions. One of the main characteristics of a marine is the uniform that he wears. On the sleeves of the Spanish Marines are the three "Sardinetas", which marks it as a member of the Royal House Corps. This was given in recognition for a heroic last stand in the Castillo del Morro of Havana, Cuba against a British expedition in 1762. The only other unit to wear the sardinetas and red trouser stripes is the Spanish Royal Guard. Spanish Marines have modern assets to comply with its mission, having personnel specialised in artillery, sapping, helicopters, special operations, communications, tanks, among others. Some vehicles form the Grupo Mecanizado Anfibio del Tercio de Armada (the Mechanized Amphibious Group of the Navy Tercio). The Marines of Spain are not only a fleet force, as the Spanish Royal Marine Guard Company are responsible for the defense and security forces of naval bases and facilities, naval schools and training units, and all facilities that support the Marines themselves. History First period The (Navy Infantry) was created by Charles V in 1537, when he permanently assigned the (Old Sea Companies of Naples) to the (Mediterranean Galley Squadrons). But it was Philip II who established today's concept of a landing force. This was a pure naval power projection ashore by forces deployed from ships that could maintain their ability to fight despite being based on board. This is the period of the famous Tercios (literally "One Third", due to its organisation: one third of