Sanity wrote:

First of all, a corpsman is not a Marine, he's Navy. In hospitals
they serve as nurses and doctors aids. In the field they perform
emergency first aid and triage.

Right. A corpsman is a navy man - there are no corpswomen. In
hospitals, he may serve as a nurse or orderly, but he's still a
corpsman, not a nurse or an physician's assistant.


Semantics

Uh, no. It's similar to the difference between a Ph.D. and an M.D. A "nurse"
has completely different training than a corpsman and there are completely
different legal ramifications associated with the care given by each.

For example, a "nurse" can write prescriptions (under the authority of a
physician), a corpsman can't.