January 27 in Military History

Thomas Edison received a patent for his incandescent electric lamp, a technological revolution that would transform military operations, from searchlights and signal lamps to the electrification of naval vessels.

The Soviet Union announced the complete lifting of the Siege of Leningrad, ending the longest and most destructive siege in modern history. An estimated 1.5 million soldiers and civilians died during the 872-day blockade.

The Red Army's Leningrad-Novgorod Strategic Offensive drove German Army Group North away from its artillery positions surrounding the city, fully lifting the longest siege ever endured by a major city in modern history. The 872-day encirclement had killed over a million civilians and become a defining symbol of Soviet resistance and suffering on the Eastern Front.

Soviet troops of the 322nd Rifle Division liberated the Auschwitz-Birkenau concentration and extermination camp, revealing to the world the full horror of the Nazi Holocaust that killed over 1.1 million people.

Soviet soldiers of the 322nd Rifle Division entered the Auschwitz-Birkenau concentration and extermination camp complex in occupied Poland, liberating approximately 7,000 surviving prisoners. The soldiers discovered the remains of the Nazi regime's most industrialized killing center, where over 1.1 million people had been murdered.

A flash fire during a launch pad test killed astronauts Gus Grissom, Ed White, and Roger Chaffee inside the Apollo 1 command module. All three were military pilots, and the disaster reshaped NASA's safety culture.

A flash fire during a launch pad test killed NASA astronauts Gus Grissom, Ed White, and Roger Chaffee, all military officers, inside the Apollo 1 command module at Cape Kennedy. The disaster temporarily halted the space program and led to major redesigns that ultimately enabled the successful Moon landings.

The Paris Peace Accords were formally signed, ending direct U.S. military involvement in the Vietnam War. The agreement called for a ceasefire, withdrawal of U.S. forces, and return of prisoners of war.

The United States, North Vietnam, South Vietnam, and the Viet Cong signed the Paris Peace Accords, officially ending direct American military involvement in the Vietnam War. The agreement provided for a ceasefire, the withdrawal of remaining U.S. forces, and the return of American prisoners of war.

Steve Jobs unveiled the iPad, a device that would rapidly be adopted by the U.S. military for flight operations, tactical planning, and field communications, replacing heavy paper manuals and maps.