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Geophysical MASINT — is a branch of Measurement and Signature Intelligence (MASINT) that involves phenomena transmitted through the earth (ground, water, atmosphere) and manmade structures including emitted or reflected sounds, pressure waves, vibrations, and… … Wikipedia
Doppler effect — Change of wavelength caused by motion of the source. An animation illustrating how the Doppler effect causes a car engine or siren to soun … Wikipedia
USS Willis (DE-395) — USS Willis (DE–395) is an Sclass|Edsall|destroyer escort, the first United States Navy ship so named. This ship was named for Ensign Walter Michael Willis (14 January 1917 7 December 1941). He enlisted in the Naval Reserve as a seaman 2d class at … Wikipedia

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