Sentence:  After two minutes of aerodynamic breaking — now some 400 kilometres below the entry interface, and with the probe having slowed to the speed of sound — a mortar was programmed to deploy the small drogue into the slipstream, and once the drogue had slowed the probe to 430 kilometres per hour the <WSD>afterbody</WSD> shield was to be released so that the 2.5-metre wide dacron main parachute could be deployed. 
Meaning of the word marked with <WSD> tags:  A section or piece of a launch vehicle, rocket, or spacecraft that enters the atmosphere unprotected behind the nose cone or other body that is protected for entry.