This is a cutaway of the Entac, a French, wire-guided anti-tank missile propelled by a two-stage solid fuel rocket and one of the first wire-guided anti-tank missiles. Developed by the Direction des Etudes et Fabrications d'Armement, Entac
was designed to destroy heavy armor over ranges of 1,300 to 6,600 feet. It had a top speed of 190 mph.
It was adopted by the French Army in 1957 and supplied to 13 countries including the U.S. By 1970, some 330,000 of the missiles had been produced. Entac ceased production in 1974 and in the U.S. it was replaced by the TOW (Tube-launched, Optically-tracked, Wire-guided) missile. This object was donated to the Smithsonian in 1980 by the U.S. Army.
This object is on display in Rockets & Missiles at the Steven F. Udvar-Hazy Center in Chantilly, VA.