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In page Switzerland:

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The Swiss Armed Forces, including the Land Forces and the Air Force, are composed mostly of conscripts, male citizens aged from 20 to 34 (in exceptional cases up to 50) years. Being a landlocked country, Switzerland has no navy; however, on lakes bordering neighbouring countries, armed boats patrol. Swiss citizens are prohibited from serving in foreign armies, except for the Swiss Guards of the Vatican, or if they are dual citizens of a foreign country and reside there.[citation needed]