U.S. Air Force Staff Sgt. Michael Pfeiffer, 35th Communications Squadron cyber transport systems supervisor, uses an optical time domain reflectometer to run a test on a data circuit at Misawa Air Base, Japan, Feb. 23, 2014. The OTDR emits data in the form of light from the circuit to the end users to test the quality of the fiber optic cables. (U.S. Air Force photo/Staff. Sgt Tong Duong)
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