page_title: First United States Army
hierarchical_section_title: First United States Army
context_page_description: First Army is the oldest and longest-established field army of the United States Army. It now serves as a theater army having seen service in both World War I and World War II, under some of the most famous and distinguished officers of the U.S. Army. It now serves as a mobilization, readiness and training command.
context_section_description: First Army is the oldest and longest-established field army of the United States Army. It now serves as a theater army having seen service in both World War I and World War II, under some of the most famous and distinguished officers of the U.S. Army. It now serves as a mobilization, readiness and training command.
caption: Shoulder sleeve insignia and combat service identification badge of the First United States Army.