How a second lieutenant promrote to lieutenant?

*become Well, you'd have to go though US Army Officer Candidate School (after college), US Army ROTC (during college), or apply and be accepted to (and graduate from) the United States Military...

i think so. cuz in movies u nevr hear any1 address a first or second lieutenant This depends. Second Lieutenants and First Lieutenants are both addressed verbally as "Lieutenant". The Army, Marine...

Second Lieutenant is the most junior officer rank, and artillery is the branch they're assigned to.

Yes all commissed officers are involved in the organisation of the troops

The equivalent rank to an Army / Marine / Air Force 2nd Lieutenant is an Ensign (O-1).