 After the move from the Cape MCC to the Houston MCC in 1965, the new MOCRs, which were larger and more sophisticated than the single Cape MCC, consisted of four rows, with the first row, later known as "the Trench" (a term coined by Apollo-era RETRO controller John Llewellyn, which, according to Flight Director Eugene Kranz, reminded him of the firing range during his years as a USAF officer).It was occupied by the BOOSTER, RETRO, FIDO, and GUIDO controllers.During Gemini, the BOOSTER position was handled by both an engineer from Martin Marietta and an astronaut, while all missions from Apollo 7 used engineers from the Marshall Space Flight Center.