Vibration tests in support of manned space flight have been conducted by MSC since the origin of the Manned Spacecraft Center; this, of course, is ever increasing in both magnitude and scope and now embraces the field of acoustic testing. This paper discusses the sources of dynamic excitation in flight, whether vibration or acoustics, to the spacecraft or its occupants, and relates the resulting forces to the need for certain test facilities. Such facilities, either in existence or currently in construction, are described with regard to their physical make and environmental‐simulation potential and their use is illustrated by descriptive examples, experimental programs, test procedures, and technical results.