What do Officers in the Army do?

Links to each of the branches in the Army

Air Defense Artillery
Armor
Aviation
Field Artillery
Infantry
Special Forces
Chemical Corps
Corps of Engineers
Military Intelligence
Military Police
Signal Corps
Adjutant General Corps
Finance
Ordnance Corps
Quartermaster Corps
Transportaion Corps
Medical Service Corps
Judge Advocate General Corps
Veterinary Corps
Chaplain Corps

Overview of branches