US military history is filled with units whose names not only convey a whiff of combat — 101st Airborne, First Air Cavalry, 14th Field Artillery — but also describe what the unit did on the battlefield. But what is one to make of an outfit with a name like 23d Headquarters Special Troops?
That unit, consisting of 1,100 troops, was special, all right. The 23d, which served during World War II in England, France, Belgium, Luxembourg, and Germany, is the subject of “The Ghost Army.” Written and directed by Lexington resident Rick Beyer, the documentary airs Tuesday night on Channel 2. Peter Coyote narrates.