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In 1949, a contract was awarded to Sierra Engineering Company of Sierra Madre, Calif., and deliveries began in 1950.[39] This dummy quickly became known as “Sierra Sam.”

In 1952, a contract for anthropomorphic dummies was awarded to Alderson Research Laboratories, Inc., of New York City.[40] Dummies constructed by both companies possessed the same basic characteristics: a skeleton of aluminum or steel, latex or plastic skin, a cast aluminum skull, and an instrument cavity in the torso and head for the mounting of strain gauges, accelerometers, transducers, and rate gyros.[41] Models used by the Air Force were primarily parachute drop and ejection seat versions with center of gravity tolerances within one quarter inch.

Over the next several years the two companies improved and redesigned internal structures and instrumentation, but the basic external appearance of the dummies remained relatively constant from the mid 1950s to the late 1960s. Dummies of these types were most likely the “aliens” associated with the “Roswell Incident.”