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Prototype of the "mail box" constructed at the Manned Spacecraft Center (MSC) to remove carbon dioxide from the Apollo 13 Command Module (CM) is displayed in the Mission Control Center (MCC). The "mail box" was constructed when it became apparent CO2 was prevalent in the CM and the spacecraft's lithium hydroxide system was not removing it sufficiently. A space suit exhaust hose is connected to a lithium hydroxide canister to purge the cabin air. There are 16 such canisters in the CM and each will last approximately 12 hours. Looking at the "mail box" are (from the left): Milton L. Windler, shift 1 flight director; Dr. Donald K. (Deke) Slayton, director of flight crew operations, MSC; Howard W. Tindall, deputy director, flight operations, MSC; Sigurd A. Sjoberg, director, flight operations, MSC; Dr. Christopher C. Kraft, deputy director, MSC; and Dr. Robert R. Gilruth, director, MSC.