noun
land, sea and air
Refers to the three physical domains, often in contexts like transportation, geography, or general capability.
陸海空の交通網が整備されている。
The transportation network across land, sea, and air is well-developed.
noun
army, navy and air force
Specifically the three branches of the military; often used in compounds like 陸海空軍.
陸海空の自衛隊が災害救助に出動した。
The army, navy, and air force self-defense units were dispatched for disaster relief.