The services use different insignia for different ranks. A double silver bar in the army is a captain. In the Navy and the Coast Guard that same insignia is a Lt. Go to www.military.com and they may show you the different insignias.
It holds the same importance as any civilian job, why is a Manger or General/Area/District Manager important and what is the difference other than their own roles and responsibilities, you have to...
It really depends on the branch of service mainly because each branch has its own regulations and procedures on promotion's, however one way would be:Increase or strengthen yourself...
The U.S. military ranks in 1945 from lowest in command to highest in command are:
Private
Private 1st class
Corporal
Sergeant
Staff Sergeant
Sergeant 1st class
Master Sergeant
First...