The members of the 58th receive letters from home, some with good news, some with bad, while McQueen and Cooper are ordered to cooperate in a TV documentary about In Vitroes serving in the United States Marine Corps.

On a planet overrun with Chigs, the 58th retreat with a tank driver of the US 7th Cavalry upon a tank named "Pearly". They encounter the eccentric Major Cyril MacKendrick, sole survivor of a battalion of the British Coldstream Guards. Wang encounters a Silicate of the same model that previously tortured him.