In support of an official event 

The Museum will be closed Sunday, May 25
In addition, the Fourth Hangar will be closed Saturday, May 24

Guided tours of the 4th building, normally scheduled at 3:00 p.m. daily, are canceled through May 28.

Effective immediately, the William E. Boeing Presidential Gallery will have limited guest access due to scheduled event preparations. The only accessible exhibits during this time include: Douglas VC-54 Sacred Cow, Flying the President Exhibit, USAF Established Artifact. We anticipate full gallery access will resume by June 5, 2025.

Image Gallery

ADSID III Electronic Seismic Sensor

This ADSID III electronic seismic sensor was one of several types dropped by U.S. aircraft along enemy roads and pathways in Southeast Asia. It was essentially a radio transmitter that picked up ground vibrations made by enemy trucks and troop movements and transmitted these signals to a friendly intelligence center through an airplane flying overhead. By keeping a record of these transmissions, U.S. personnel were able to determine the rate of enemy activity in any particular area and order an air strike when it became sufficiently promising. Seismic sensors were designed to stick in the ground when dropped from an aircraft. Another type of detection device was the acoustic sensor which transmitted the actual sound, not ground vibrations, made by enemy trucks and personnel. It was designed to hang from a tree by its parachute after the drop. The sensor program, known as Igloo White, went into operation along the Ho Cho Minh Trail in December 1967. (U.S. Air Force photo)

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This photograph is considered public domain and has been cleared for release. If you would like to republish please give the photographer appropriate credit. Further, any commercial or non-commercial use of this photograph or any other DoD image must be made in compliance with guidance found at https://www.dimoc.mil/resources/limitations, which pertains to intellectual property restrictions (e.g., copyright and trademark, including the use of official emblems, insignia, names and slogans), warnings regarding use of images of identifiable personnel, appearance of endorsement, and related matters.