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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 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...
private e1 no insignia private e1 private fist class corporal/specialist Sargent staff Sargent Sargent first class master Sargent first Sargent Sergent major command Sargent major 2nd lieutenant 1st...