Captain Dennet says the three guardsmen are operating an M-4 tank, better known as the Sherman tank. It's actually an M-3 Stuart.
The three protagonists are National Guardsmen on war-game maneuvers. So why are their weapons carrying live loads?
Narrator: 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, in a historical ledger located in a reading room known as the Twilight Zone.
Narrator: June 25th, 1964 - or, if you prefer, June 25th, 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.
Included on volume 19 of Image-Entertainment's DVD collection.