"June twenty-fifth 1964 - or, if you prefer, June twenty-fifth 1876. The cast of characters in order of their appearance: a patrol of General Custer's cavalry and a patrol of National Guardsmen on a maneuver. Past and present are about to collide head-on, as they are wont to do in a very special bivouac area known as... the Twilight Zone."
Three United States Army National Guard soldiers (MSgt. William Connors, Pvt. Michael McCluskey, Cpl. Richard Langsford) are an M5 Stuart tank crew participating in a war game being conducted near the Battle of Little Bighorn, the site of Lieutenant Colonel George Custer's last stand. Their orders coincide with the route of Custer and his men. As they follow the route, they hear strange things such as Indian battle cries and horses running. As nobody is there, the men examine the possibilities. Connors wonders if they've somehow gone back in time. When they return, Connors reports to his captain what occurred and is reprimanded. The following day the trio goes out and again begins to experience strange phenomena. The captain contacts them via radio and orders them to return to base when Connors tries to explain what is happening. Connors breaks contact and the captain sends MPs to bring them in. However, the three men abandon their tank and continue on foot with their side arms and rifles. They find a group of tepees and McCluskey goes to investigate; he soon returns with an arrow protruding from his back. The men climb a ridge where they see a battle taking place below. They join it and are never seen again.
Later, the captain enters the Custer Battlefield National Monument. An MP reports that all they found was the abandoned tank. The two of them notice the names of their missing soldiers on the monument with the names of Custer's men. The captain states that it was a pity the missing soldiers couldn't have taken the tank with them to the battle.
"Sergeant William Connors, Trooper Michael McCluskey, and Trooper Richard Langsford, who, on a hot afternoon in June, made a charge over a hill - and never returned. Look for this one under 'P' for phantom, is a historical ledger located in a reading room known as the Twilight Zone."