US Navy SEALs

The SEALs — Sea, Air, Land — were commissioned in 1962 at Kennedy's push for unconventional capability, but their bloodline is older: the Naval Combat Demolition Units and Underwater Demolition Teams whose frogmen cleared invasion beaches from Normandy to Okinawa with swim fins, sheath knives, and explosives, often under fire and nearly naked.

Vietnam built the SEAL reputation in the Mekong Delta's mud: small direct-action squads ambushing, snatching prisoners, and hunting Viet Cong infrastructure at night, so effectively that the enemy called them 'the men with green faces.' The teams' selection course — BUD/S, with its Hell Week and its bell for quitting — became the most famous ordeal in the American military, and the institutional filter that defines the force.

The modern era expanded the missions — maritime counterterrorism, hostage rescue, and the long land wars of the 2000s, where SEALs fought far from any beach — and made them, after the bin Laden raid of 2011, the most publicly famous special operations force on earth: a mixed blessing the community itself debates. The core remains the UDT inheritance: comfort in the water no other force matches, and the community's standing conviction that the only easy day was yesterday.

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