Mountaineering has long been a necessary skill for U.S. service members in battle and at the Army Mountain Warfare School, they learn from some of the best. Source: www.war.gov

From its introduction into the Navy in the late 1800s, baseball became a phenomenon that U.S. sailors — many of whom were Major League pros — helped to spread around the world. Source: www.war.gov

The Space Force structure is unique. While it is a separate and distinct branch of the armed services, it is organized under the Department of the Air Force. Source: www.war.gov

From Revolutionary War battlefields to today’s frontlines, the Purple Heart has served as a recognition of sacrifice and heroism. How well do you know the history behind America’s oldest military medal? Source: www.war.gov

Undefeated in battle, the USS Constitution is more than 200 years old and still afloat. Can you emerge victorious in a quiz on this venerable Ship of State? Source: www.war.gov

Meet Boston’s only undefeated team: the crew aboard Old Ironsides! Step aboard the oldest and toughest warship in all seven seas, which doubles as a living — and floating — museum. Source: www.war.gov

The department helped make another “Mission: Impossible” possible. Military expertise, feedback and equipment provided authenticity to make the magic of Hollywood feel real. Source: www.war.gov

Thousands of American service personnel are missing from previous conflicts and the Defense POW/MIA Agency remains relentless in its mission to provide the fullest possible accounting to their families and the nation, until they’re home. Source: www.war.gov

The triad, along with assigned forces, provide 24/7 deterrence to prevent catastrophic actions from our adversaries and they stand ready, if necessary, to deliver a decisive response, anywhere, anytime. Source: www.war.gov

Composed of an active-duty and two reserve components, learn about the Air Force’s structure and more key facts. Source: www.war.gov