The Infantry is the main land combat force and core fighting strength of the Army. It's equally important during peacetime and in combat. The role of an Infantry Officer is to be a leader in operations specific to the Infantry and to lead others in all areas of land combat.

The Army's Field Artillery Branch is responsible for neutralizing or suppressing the enemy by cannon, rocket and missile fire and to help integrate all fire support assets into combined arms operations. The role of a Field Artillery Officer is to be a leader in operations specific to the Field Artillery Branch and to be an expert in the tactics, techniques and procedures for the employment of fire support systems.

The Army's Aviation Branch is critical in so many of the Army's operations. From providing quick-strike and long-range target engagement during combat operations to hauling troops and supplies, Army helicopter units are key in getting the job done in many situations. An Officer within the Aviation Branch is first an expert aviator, but is also responsible for the coordination of Aviation operations from maintenance to control tower operations to tactical field missions.

The Army's Finance Corps is responsible for sustaining operations through purchasing and acquiring supplies and services. Officers in the Finance Corps make sure commercial vendors are paid, contractual payments are met, balancing and projecting budgets, paying Soldiers for their service and other financial matters of keeping the Army running.

The Armor branch provides the Army’s fast, powerful ground combat force. Armor officers lead tank and scout units that bring speed, firepower and protection to the fight. They find and defeat enemy forces, protect friendly troops and support infantry and other units. Armor officers are experts in combined-arms operations and lead from the front in demanding combat environments to help U.S. forces move, fight and win.

The Air Defense Artillery branch protects U.S. forces, equipment and critical locations from enemy aircraft, missiles and drones. Air Defense Artillery officers use advanced radar, sensors and missile systems to detect, track and defeat aerial threats before they can strike. They provide early warning, coordinate with joint and allied forces and help control the airspace to keep soldiers safe on the ground. These officers play a key role in ensuring units can move freely, respond quickly and operate securely in combat and crisis environments.