<Tr> <Th> Year </Th> <Th> Heraldry </Th> <Th> Name </Th> <Th> Founder </Th> <Th> Founding location </Th> <Th> Current location </Th> <Th> Notes </Th> </Tr> <Tr> <Td> 1248 </Td> <Td> </Td> <Td> King's Own Immemorial 1st Infantry Regiment </Td> <Td> Ferdinand III of Castile </Td> <Td> Crown of Castile </Td> <Td> Madrid, Spain </Td> <Td> It was one of the first standing units in Europe since the fall of the Roman Empire, remaining in the order of battle of the Castilian and Spanish armies since its creation . At present the Regiment is the Unit responsible for providing the central seat of Spanish Army Headquarters security, services, and support needed for its functioning . </Td> </Tr> <Tr> <Td> 1337 </Td> <Td> </Td> <Td> Royal Militia of the Island of Jersey </Td> <Td> King Edward III of England </Td> <Td> England </Td> <Td> United Kingdom </Td> <Td> In 1987, it was re-formed as a Territorial Army regiment, the Jersey Field Squadron (The Royal Militia Island of Jersey), 111th Regiment, Royal Engineers, later 73rd Regiment, Royal Engineers . In 2007, it came under the operational command of the Royal Monmouthshire Royal Engineers (Militia). </Td> </Tr> <Tr> <Td> 1479 </Td> <Td> </Td> <Td> 1st Infantry Regiment </Td> <Td> King Louis XI of France </Td> <Td> Kingdom of France </Td> <Td> Sarrebourg, France </Td> <Td> Founded in 1479 - 1480 by King Louis XI as Bandes de Picardie . It became the Légion de Picardie in 1558 during the Italian War of 1551 - 1559 and then Régiment de Picardie on May 29, 1569 . It was ultimately renamed 1 régiment d'infanterie de ligne in 1791 after the military reforms of Louis Le Bègue Duportail . It is now part of the Franco - German Brigade (French units of the brigade are part of 1st Division) and was recently deployed in Afghanistan, Mali and the Central African Republic . </Td> </Tr>

What branch of the us military is the oldest