What Is 1st Division

Overview

The 1st Infantry Division, also known as 'The Big Red One' due to its iconic red numeral '1' shoulder patch, is the first permanent division established in the United States Army. Formed on June 8, 1917, it played a pivotal role in World War I, marking the beginning of America’s modern expeditionary military capability. Since its inception, the division has maintained continuous service, adapting to evolving warfare doctrines and technologies.

Headquartered at Fort Riley, Kansas, the 1st ID has served in nearly every major U.S. conflict of the 20th and 21st centuries. Its legacy includes combat deployments in World War I, World War II, Vietnam, the Gulf War, Iraq, and Afghanistan. The division's motto, 'No mission too difficult, no sacrifice too great,' reflects its long-standing commitment to frontline operations and rapid deployment readiness.

• Formation date: The 1st Infantry Division was officially created on June 8, 1917, just months after the U.S. entered World War I, making it the Army’s oldest continuously serving division.
• First overseas deployment: In June 1918, the division arrived in Saint-Nazaire, France, becoming the first American division to enter combat in Europe during World War I.
• World War II contributions: The 1st ID landed on Omaha Beach on D-Day, June 6, 1944, suffering heavy casualties while securing a critical beachhead during the Normandy invasion.
• Medal of Honor count: Soldiers of the 1st Infantry Division have been awarded 24 Medals of Honor, with 10 during WWII, 8 in Vietnam, and 6 in other conflicts.
• Modern structure: As of 2023, the division includes two armored brigade combat teams, a division headquarters, and support units, all based at Fort Riley, Kansas.

How It Works

The 1st Infantry Division operates as a combined arms unit, integrating infantry, armor, artillery, and support elements under a single command structure for maximum battlefield effectiveness. Its organizational model allows for rapid deployment and sustained combat operations across diverse terrains and threat levels.

• Command Structure: Led by a two-star general (Major General), the division oversees brigades, battalions, and specialized units through a hierarchical command system designed for flexibility and speed.
• Brigade Combat Teams (BCTs): The division currently fields two armored BCTs, each with tanks, infantry fighting vehicles, and artillery, enabling high-intensity maneuver warfare.
• Deployment Cycle: Units follow a 3-year rotational cycle, including training, deployment, and reset phases, ensuring readiness for global contingency operations.
• Support Elements: The division includes a division sustainment brigade that manages logistics, medical support, and supply chains during prolonged missions.
• Training Regimen: Soldiers undergo rigorous exercises at the Joint Readiness Training Center (JRTC) in Louisiana, simulating real-world combat scenarios before deployment.
• Technology Integration: The 1st ID employs advanced command and control systems, drones, and encrypted communications to maintain battlefield awareness and coordination.

Comparison at a Glance

Below is a comparison of the 1st Infantry Division with other notable U.S. Army divisions based on formation date, combat history, and current structure.

This table highlights the 1st ID’s distinction as the Army’s oldest continuously active division. While airborne and cavalry units specialize in rapid insertion or reconnaissance, the 1st ID remains a cornerstone of conventional ground combat power, with unmatched historical depth and operational experience.

Why It Matters

The 1st Infantry Division symbolizes the enduring strength and adaptability of the U.S. Army. Its century-long service underscores the nation’s military readiness and commitment to global security, serving as a model for training, leadership, and combat effectiveness.

• Strategic Deterrence: The division’s presence in NATO and Indo-Pacific regions serves as a visible deterrent against potential adversaries, reinforcing alliance commitments.
• Combat Proven: With over 100 years of active service, the 1st ID has shaped modern infantry tactics and armored warfare doctrine.
• Training Influence: Its units often serve as testbeds for new military technologies and operational concepts adopted Army-wide.
• Recruitment Symbol: The 'Big Red One' insignia is a powerful recruiting tool, representing elite status and tradition to prospective soldiers.
• Humanitarian Role: Beyond combat, the division has supported disaster relief and peacekeeping missions in Kosovo, Haiti, and Africa.
• Legacy Preservation: The 1st ID Museum at Fort Riley educates the public on U.S. military history and the cost of freedom.

As the U.S. military continues to modernize, the 1st Infantry Division remains a vital component of national defense, bridging historical legacy with future readiness.