Military is the combined forces meant for war. That is the Army, Air Force, and Navy.
The Army is land based warfare, the Navy is sea based warfare, and Air Force is Air based.
The US Marines are a mix between Navy and Army. They specialize in coastal invasions, but can be used as general infantry (like the Army).
From the US perspective:
The Air Force has fixed wing planes. The cannot have helicopters; the Army can have helicopters but no (combat) fixed wing aircraft. The Navy also has fixed wing aircraft; the main distinction (from an outsider perspective) is that the Air Force is generally more geared towards collecting intel these days.
The Navy has ships. They also have fixed-wing aircraft, but also have helicopters. They also sometimes do amphibious operations.
The Army is a land army. The Marines are ostensibly focused on amphibious operations, however the Navy now has their own amphibious assault groups so now they’re just a smaller land army and marines are literally just soldiers except they count going to McDonald’s as a deployment.
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