December 21 in Military History

English settlers aboard the Mayflower came ashore at Plymouth, Massachusetts, establishing the colony that would become the foundation of New England and a precursor to the militia tradition that defined early American military culture.

President Abraham Lincoln signed Senate Bill 82 authorizing the Medal of Honor for Navy enlisted men. An equivalent medal for Army enlisted personnel was authorized the following July, and officer eligibility was added in 1863. The Medal of Honor remains the highest American military decoration for valor and has been awarded 3,528 times in all conflicts since the Civil War.

Lakota, Cheyenne, and Arapaho warriors led by Red Cloud ambushed and killed all 81 soldiers under Captain William Fetterman near Fort Phil Kearny, Wyoming, the worst U.S. Army defeat on the Great Plains until the Battle of Little Bighorn a decade later.

President Theodore Roosevelt dispatched sixteen battleships of the U.S. Atlantic Fleet, painted white in peacetime colors, on a 43,000-mile circumnavigation of the globe, the most ambitious naval demonstration in American history. The fourteen-month voyage announced the United States as a world naval power.

Six days into the Ardennes Offensive, German forces reached their deepest penetration of Allied lines, with spearheads approaching the Meuse River crossings. Stubborn American resistance at key crossroads towns including Bastogne, St. Vith, and Elsenborn Ridge was slowing the offensive and buying time for counterattacks.

General George S. Patton Jr. died in Heidelberg, Germany, twelve days after a car accident left him paralyzed, ending the life of the most feared Allied commander among German generals.

General George S. Patton, commander of the Third U.S. Army during the drive from Normandy to Germany and relief of Bastogne, died in Heidelberg, Germany, from injuries sustained in an automobile accident twelve days earlier. One of the most aggressive and successful American field commanders of World War II, Patton was 60 years old at his death.

Apollo 8, crewed by Air Force Colonel Frank Borman, Navy Captain Jim Lovell, and Air Force Major William Anders, launched from Kennedy Space Center on the first manned mission to orbit the Moon. All three astronauts were military officers who would make humanity's first voyage to another celestial body.

Apollo 8 launched from Kennedy Space Center with astronauts Frank Borman, Jim Lovell, and William Anders aboard for the first crewed mission to leave Earth orbit and travel to the Moon. The 147-hour mission, which included ten lunar orbits on Christmas Eve, proved the Saturn V and the Command and Service Module could support lunar operations and placed the United States decisively ahead in the Cold War space race.

Pan Am Flight 103 was destroyed by a terrorist bomb over Lockerbie, Scotland, killing all 259 aboard and 11 on the ground, prompting major changes to aviation security and international counterterrorism cooperation.

A Pan American Boeing 747-121 named Clipper Maid of the Seas exploded over the Scottish town of Lockerbie, killing all 259 passengers and crew aboard and 11 people on the ground. The bombing was attributed to Libyan intelligence operatives and led to United Nations sanctions against Libya and, eventually, the handover of two Libyan suspects for trial under Scottish law. The attack set precedents for aviation security, intelligence sharing, and state sponsorship of terrorism investigations.

NATO's Implementation Force (IFOR) began deploying 60,000 troops, including 20,000 Americans, to Bosnia-Herzegovina to enforce the Dayton Peace Agreement that ended the Bosnian War. It was the largest military operation in NATO's history and the alliance's first major ground deployment.