do navy ever fight on land and if so who?

Answer 1

Absolutely - the U.S. Navy SEAL's primarily operate on land, but are also Sea and Air warfare qualified. The Navy's SeaBees (Mobile Construction Battalions), while not essentially a combat unit, are trained in infantry combat tactics by the Marine Corps. All SeaBees must complete the Marine Corps Basic Infantry and Rifleman courses.

Whether or not you want to include Naval Aircraft fighting over land is up to you, but the bulk of their missions are land targets.

The Navy actually includes the US Marine Corps, specifically designed for Amphibious assaults using landing craft or helicopters for insertion into enemy areas. Navy ships serve as the launching platforms and provide naval gunfire support to US ground forces within range.