What country has the world’s longest standing army?

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On a tour of the Vatican, they said that the Pontifical Swiss Guard, established in 1506 under Pope Julius II, is the oldest military unit in continuous operation. They have great uniforms, but they are not the oldest. The record goes to Infantry Regiment “Inmemorial del Rey” No. 1, which is part of the Spanish Army. It has going since 1248. (Don’t believe everything they tell you on tours.)