United States Army

The United States Army or Department of the Army was a contingent of the United States of America armed forces.

Background
Candidates achieved the rank of private once successfully completing basic training at locations such as Fort McClintock. Joined by Marines, training exercises were conducted in the form of war games.

Anchorage
The Chinese army invaded Alaska in the winter of 2066. After ten years of occupation, American Army forces launched an offensive in Anchorage that successfully liberated the city on January 10, 2077.

Domestic activity
Beginning August 1, 2077, the 104th Infantry Regiment's Echo Company was responsible for staffing the South Boston military checkpoint, performing vehicle inspections and detaining passengers as applicable. Members of the US Army Reserve under the 708th Infantry Division were deployed to assist the Boston Police Department with food distribution.

Post-War
The 121st Infantry Platoon, nicknamed Firebats, was deployed to Monongah Power Plant after the Great War to protect the power plant from invasion. 

Behind the scenes

 * The US Department of the Army was planned for inclusion in the canceled Van Buren project.
 * The real world US Army logo appears on billboards seen in Fallout: New Vegas.